sphinx.addnodesdocument)}( rawsourcechildren]( translations LanguagesNode)}(hhh](h pending_xref)}(hhh]docutils.nodesTextChinese (Simplified)}parenthsba attributes}(ids]classes]names]dupnames]backrefs] refdomainstdreftypedoc reftarget(/translations/zh_CN/hwmon/dell-smm-hwmonmodnameN classnameN refexplicitutagnamehhh ubh)}(hhh]hChinese (Traditional)}hh2sbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget(/translations/zh_TW/hwmon/dell-smm-hwmonmodnameN classnameN refexplicituh1hhh ubh)}(hhh]hItalian}hhFsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget(/translations/it_IT/hwmon/dell-smm-hwmonmodnameN classnameN refexplicituh1hhh ubh)}(hhh]hJapanese}hhZsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget(/translations/ja_JP/hwmon/dell-smm-hwmonmodnameN classnameN refexplicituh1hhh ubh)}(hhh]hKorean}hhnsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget(/translations/ko_KR/hwmon/dell-smm-hwmonmodnameN classnameN refexplicituh1hhh ubh)}(hhh]hPortuguese (Brazilian)}hhsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget(/translations/pt_BR/hwmon/dell-smm-hwmonmodnameN classnameN refexplicituh1hhh ubh)}(hhh]hSpanish}hhsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget(/translations/sp_SP/hwmon/dell-smm-hwmonmodnameN classnameN refexplicituh1hhh ubeh}(h]h ]h"]h$]h&]current_languageEnglishuh1h hh _documenthsourceNlineNubhcomment)}(h)SPDX-License-Identifier: GPL-2.0-or-laterh]h)SPDX-License-Identifier: GPL-2.0-or-later}hhsbah}(h]h ]h"]h$]h&] xml:spacepreserveuh1hhhhhhB/var/lib/git/docbuild/linux/Documentation/hwmon/dell-smm-hwmon.rsthKubh)}(h4This data file has been placed in the public domain.h]h4This data file has been placed in the public domain.}hhsbah}(h]h ]h"]h$]h&]hhuh1hhhhhho/srv/docbuild/lib/venvs/build-kernel-docs/lib64/python3.9/site-packages/docutils/parsers/rst/include/isonum.txthKubh)}(hDerived from the Unicode character mappings available from . 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SOFT HYPHENh]h­}hjsbah}(h]h ]h"]shyah$]h&]uh1hhhhKHhhhhubh)}(h(.. |sol| unicode:: U+0002F .. SOLIDUSh]h/}hjsbah}(h]h ]h"]solah$]h&]uh1hhhhKIhhhhubh)}(h,.. |sung| unicode:: U+0266A .. EIGHTH NOTEh]h♪}hjsbah}(h]h ]h"]sungah$]h&]uh1hhhhKJhhhhubh)}(h0.. |sup1| unicode:: U+000B9 .. SUPERSCRIPT ONEh]h¹}hjsbah}(h]h ]h"]sup1ah$]h&]uh1hhhhKKhhhhubh)}(h0.. |sup2| unicode:: U+000B2 .. SUPERSCRIPT TWOh]h²}hjsbah}(h]h ]h"]sup2ah$]h&]uh1hhhhKLhhhhubh)}(h2.. |sup3| unicode:: U+000B3 .. SUPERSCRIPT THREEh]h³}hjsbah}(h]h ]h"]sup3ah$]h&]uh1hhhhKMhhhhubh)}(h4.. |times| unicode:: U+000D7 .. MULTIPLICATION SIGNh]h×}hjsbah}(h]h ]h"]timesah$]h&]uh1hhhhKNhhhhubh)}(h0.. |trade| unicode:: U+02122 .. TRADE MARK SIGNh]h™}hjsbah}(h]h ]h"]tradeah$]h&]uh1hhhhKOhhhhubh)}(h... |uarr| unicode:: U+02191 .. UPWARDS ARROWh]h↑}hj.sbah}(h]h ]h"]uarrah$]h&]uh1hhhhKPhhhhubh)}(h... |verbar| unicode:: U+0007C .. VERTICAL LINEh]h|}hj=sbah}(h]h ]h"]verbarah$]h&]uh1hhhhKQhhhhubh)}(h*.. |yen| unicode:: U+000A5 .. YEN SIGN h]h¥}hjLsbah}(h]h ]h"]yenah$]h&]uh1hhhhKRhhhhubhsection)}(hhh](htitle)}(hKernel driver dell-smm-hwmonh]hKernel driver dell-smm-hwmon}(hjbhhhNhNubah}(h]h ]h"]h$]h&]uh1j`hj]hhhhhKubh field_list)}(hhh](hfield)}(hhh](h field_name)}(h Copyrighth]h Copyright}(hj|hhhNhNubah}(h]h ]h"]h$]h&]uh1jzhjwhhhKubh field_body)}(h2|copy| 2002-2005 Massimo Dal Zotto h]h paragraph)}(hjh](h©}(hjhhhNhNubh 2002-2005 Massimo Dal Zotto <}(hjhhhNhNubh reference)}(h dz@debian.orgh]h dz@debian.org}(hjhhhNhNubah}(h]h ]h"]h$]h&]refurimailto:dz@debian.orguh1jhjubh>}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhKhjubah}(h]h ]h"]h$]h&]uh1jhjwubeh}(h]h ]h"]h$]h&]uh1juhhhKhjrhhubjv)}(hhh](j{)}(h Copyrighth]h Copyright}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jzhjhhhKubj)}(h1|copy| 2019 Giovanni Mascellani h]j)}(h0|copy| 2019 Giovanni Mascellani h](h©}(hjhhhNhNubh 2019 Giovanni Mascellani <}(hjhhhNhNubj)}(hgio@debian.orgh]hgio@debian.org}(hjhhhNhNubah}(h]h ]h"]h$]h&]refurimailto:gio@debian.orguh1jhjubh>}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhK hjubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1juhhhK hjrhhubeh}(h]h ]h"]h$]h&]uh1jphj]hhhhhKubj\)}(hhh](ja)}(h Descriptionh]h Description}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j`hjhhhhhK ubj)}(hX{On many Dell laptops the System Management Mode (SMM) BIOS can be queried for the status of fans and temperature sensors. Userspace utilities like ``sensors`` can be used to return the readings. The userspace suite `i8kutils`__ can also be used to read the sensors and automatically adjust fan speed (please notice that it currently uses the deprecated ``/proc/i8k`` interface).h](hOn many Dell laptops the System Management Mode (SMM) BIOS can be queried for the status of fans and temperature sensors. Userspace utilities like }(hj#hhhNhNubhliteral)}(h ``sensors``h]hsensors}(hj-hhhNhNubah}(h]h ]h"]h$]h&]uh1j+hj#ubh9 can be used to return the readings. The userspace suite }(hj#hhhNhNubj)}(h `i8kutils`__h]hi8kutils}(hj?hhhNhNubah}(h]h ]h"]h$]h&]namei8kutils anonymousKrefuri%https://github.com/vitorafsr/i8kutilsuh1jhj#resolvedKubh~ can also be used to read the sensors and automatically adjust fan speed (please notice that it currently uses the deprecated }(hj#hhhNhNubj,)}(h ``/proc/i8k``h]h /proc/i8k}(hjWhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hj#ubh interface).}(hj#hhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhKhjhhubh block_quote)}(h)__ https://github.com/vitorafsr/i8kutils h]htarget)}(h(__ https://github.com/vitorafsr/i8kutilsh]h}(h]id1ah ]h"]h$]h&]jPjQjOKuh1juhKkhjq referencedKubah}(h]h ]h"]h$]h&]uh1johhhKhjhhubeh}(h] descriptionah ]h"] descriptionah$]h&]uh1j[hj]hhhhhK ubj\)}(hhh](ja)}(h``sysfs`` interfaceh](j,)}(h ``sysfs``h]hsysfs}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubh interface}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1j`hjhhhhhKubj)}(hX?Temperature sensors and fans can be queried and set via the standard ``hwmon`` interface on ``sysfs``, under the directory ``/sys/class/hwmon/hwmonX`` for some value of ``X`` (search for the ``X`` such that ``/sys/class/hwmon/hwmonX/name`` has content ``dell_smm``). A number of other attributes can be read or written:h](hETemperature sensors and fans can be queried and set via the standard }(hjhhhNhNubj,)}(h ``hwmon``h]hhwmon}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubh interface on }(hjhhhNhNubj,)}(h ``sysfs``h]hsysfs}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubh, under the directory }(hjhhhNhNubj,)}(h``/sys/class/hwmon/hwmonX``h]h/sys/class/hwmon/hwmonX}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubh for some value of }(hjhhhNhNubj,)}(h``X``h]hX}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubh (search for the }(hjhhhNhNubj,)}(h``X``h]hX}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubh such that }(hjhhhNhNubj,)}(h ``/sys/class/hwmon/hwmonX/name``h]h/sys/class/hwmon/hwmonX/name}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubh has content }(hjhhhNhNubj,)}(h ``dell_smm``h]hdell_smm}(hj$hhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubh7). A number of other attributes can be read or written:}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhKhjhhubhtable)}(hhh]htgroup)}(hhh](hcolspec)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jFhjCubjG)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jFhjCubjG)}(hhh]h}(h]h ]h"]h$]h&]colwidthK'uh1jFhjCubhthead)}(hhh]hrow)}(hhh](hentry)}(hhh]j)}(hNameh]hName}(hjuhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK!hjrubah}(h]h ]h"]h$]h&]uh1jphjmubjq)}(hhh]j)}(hPermh]hPerm}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK!hjubah}(h]h ]h"]h$]h&]uh1jphjmubjq)}(hhh]j)}(h Descriptionh]h Description}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK!hjubah}(h]h ]h"]h$]h&]uh1jphjmubeh}(h]h ]h"]h$]h&]uh1jkhjhubah}(h]h ]h"]h$]h&]uh1jfhjCubhtbody)}(hhh](jl)}(hhh](jq)}(hhh]j)}(hfan[1-4]_inputh]hfan[1-4]_input}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK#hjubah}(h]h ]h"]h$]h&]uh1jphjubjq)}(hhh]j)}(hROh]hRO}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK#hjubah}(h]h ]h"]h$]h&]uh1jphjubjq)}(hhh]j)}(hFan speed in RPM.h]hFan speed in RPM.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK#hjubah}(h]h ]h"]h$]h&]uh1jphjubeh}(h]h ]h"]h$]h&]uh1jkhjubjl)}(hhh](jq)}(hhh]j)}(hfan[1-4]_labelh]hfan[1-4]_label}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK$hjubah}(h]h ]h"]h$]h&]uh1jphjubjq)}(hhh]j)}(hROh]hRO}(hj3hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK$hj0ubah}(h]h ]h"]h$]h&]uh1jphjubjq)}(hhh]j)}(h Fan label.h]h Fan label.}(hjJhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK$hjGubah}(h]h ]h"]h$]h&]uh1jphjubeh}(h]h ]h"]h$]h&]uh1jkhjubjl)}(hhh](jq)}(hhh]j)}(h fan[1-4]_minh]h fan[1-4]_min}(hjjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK%hjgubah}(h]h ]h"]h$]h&]uh1jphjdubjq)}(hhh]j)}(hROh]hRO}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK%hj~ubah}(h]h ]h"]h$]h&]uh1jphjdubjq)}(hhh]j)}(hMinimal Fan speed in RPMh]hMinimal Fan speed in RPM}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK%hjubah}(h]h ]h"]h$]h&]uh1jphjdubeh}(h]h ]h"]h$]h&]uh1jkhjubjl)}(hhh](jq)}(hhh]j)}(h fan[1-4]_maxh]h fan[1-4]_max}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK&hjubah}(h]h ]h"]h$]h&]uh1jphjubjq)}(hhh]j)}(hROh]hRO}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK&hjubah}(h]h ]h"]h$]h&]uh1jphjubjq)}(hhh]j)}(hMaximal Fan speed in RPMh]hMaximal Fan speed in RPM}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK&hjubah}(h]h ]h"]h$]h&]uh1jphjubeh}(h]h ]h"]h$]h&]uh1jkhjubjl)}(hhh](jq)}(hhh]j)}(hfan[1-4]_targeth]hfan[1-4]_target}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK'hj ubah}(h]h ]h"]h$]h&]uh1jphj ubjq)}(hhh]j)}(hROh]hRO}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK'hj ubah}(h]h ]h"]h$]h&]uh1jphj ubjq)}(hhh]j)}(hExpected Fan speed in RPMh]hExpected Fan speed in RPM}(hj4 hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK'hj1 ubah}(h]h ]h"]h$]h&]uh1jphj ubeh}(h]h ]h"]h$]h&]uh1jkhjubjl)}(hhh](jq)}(hhh]j)}(hpwm[1-4]h]hpwm[1-4]}(hjT hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK(hjQ ubah}(h]h ]h"]h$]h&]uh1jphjN ubjq)}(hhh]j)}(hRWh]hRW}(hjk hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK(hjh ubah}(h]h ]h"]h$]h&]uh1jphjN ubjq)}(hhh]j)}(hControl the fan PWM duty-cycle.h]hControl the fan PWM duty-cycle.}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK(hj ubah}(h]h ]h"]h$]h&]uh1jphjN ubeh}(h]h ]h"]h$]h&]uh1jkhjubjl)}(hhh](jq)}(hhh]j)}(hpwm[1-4]_enableh]hpwm[1-4]_enable}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK)hj ubah}(h]h ]h"]h$]h&]uh1jphj ubjq)}(hhh]j)}(hRW/WOh]hRW/WO}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK)hj ubah}(h]h ]h"]h$]h&]uh1jphj ubjq)}(hhh]j)}(hcEnable or disable automatic BIOS fan control (not supported on all laptops, see below for details).h]hcEnable or disable automatic BIOS fan control (not supported on all laptops, see below for details).}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK)hj ubah}(h]h ]h"]h$]h&]uh1jphj ubeh}(h]h ]h"]h$]h&]uh1jkhjubjl)}(hhh](jq)}(hhh]j)}(htemp[1-10]_inputh]htemp[1-10]_input}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK,hj ubah}(h]h ]h"]h$]h&]uh1jphj ubjq)}(hhh]j)}(hROh]hRO}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK,hj ubah}(h]h ]h"]h$]h&]uh1jphj ubjq)}(hhh]j)}(h-Temperature reading in milli-degrees Celsius.h]h-Temperature reading in milli-degrees Celsius.}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK,hj ubah}(h]h ]h"]h$]h&]uh1jphj ubeh}(h]h ]h"]h$]h&]uh1jkhjubjl)}(hhh](jq)}(hhh]j)}(htemp[1-10]_labelh]htemp[1-10]_label}(hj> hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK.hj; ubah}(h]h ]h"]h$]h&]uh1jphj8 ubjq)}(hhh]j)}(hROh]hRO}(hjU hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK.hjR ubah}(h]h ]h"]h$]h&]uh1jphj8 ubjq)}(hhh]j)}(hTemperature sensor label.h]hTemperature sensor label.}(hjl hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK.hji ubah}(h]h ]h"]h$]h&]uh1jphj8 ubeh}(h]h ]h"]h$]h&]uh1jkhjubeh}(h]h ]h"]h$]h&]uh1jhjCubeh}(h]h ]h"]h$]h&]colsKuh1jAhj>ubah}(h]h ]h"]h$]h&]uh1j<hjhhhhhNubj)}(hRDue to the nature of the SMM interface, each pwmX attribute controls fan number X.h]hRDue to the nature of the SMM interface, each pwmX attribute controls fan number X.}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK1hjhhubeh}(h]sysfs-interfaceah ]h"]sysfs interfaceah$]h&]uh1j[hj]hhhhhKubj\)}(hhh](ja)}(h-Enabling/Disabling automatic BIOS fan controlh]h-Enabling/Disabling automatic BIOS fan control}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1j`hj hhhhhK5ubj)}(hJThere exist two methods for enabling/disabling automatic BIOS fan control:h]hJThere exist two methods for enabling/disabling automatic BIOS fan control:}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK7hj hhubhenumerated_list)}(hhh](h list_item)}(hQSeparate SMM commands to enable/disable automatic BIOS fan control for all fans. h]j)}(hPSeparate SMM commands to enable/disable automatic BIOS fan control for all fans.h]hPSeparate SMM commands to enable/disable automatic BIOS fan control for all fans.}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK9hj ubah}(h]h ]h"]h$]h&]uh1j hj hhhhhNubj )}(hRA special fan state that enables automatic BIOS fan control for a individual fan. h]j)}(hQA special fan state that enables automatic BIOS fan control for a individual fan.h]hQA special fan state that enables automatic BIOS fan control for a individual fan.}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK;hj ubah}(h]h ]h"]h$]h&]uh1j hj hhhhhNubeh}(h]h ]h"]h$]h&]enumtypearabicprefixhsuffix.uh1j hj hhhhhK9ubj)}(h{The driver cannot reliably detect what method should be used on a given device, so instead the following heuristic is used:h]h{The driver cannot reliably detect what method should be used on a given device, so instead the following heuristic is used:}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK=hj hhubh bullet_list)}(hhh](j )}(huse fan state 3 for enabling BIOS fan control if the maximum fan state setable by the user is smaller than 3 (default setting). h]j)}(huse fan state 3 for enabling BIOS fan control if the maximum fan state setable by the user is smaller than 3 (default setting).h]huse fan state 3 for enabling BIOS fan control if the maximum fan state setable by the user is smaller than 3 (default setting).}(hj' hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK@hj# ubah}(h]h ]h"]h$]h&]uh1j hj hhhhhNubj )}(hDuse separate SMM commands if device is whitelisted to support them. h]j)}(hCuse separate SMM commands if device is whitelisted to support them.h]hCuse separate SMM commands if device is whitelisted to support them.}(hj? hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKChj; ubah}(h]h ]h"]h$]h&]uh1j hj hhhhhNubeh}(h]h ]h"]h$]h&]bullet-uh1j hhhK@hj hhubj)}(hXWhen using the first method, each fan will have a standard ``pwmX_enable`` sysfs attribute. Writing ``1`` into this attribute will disable automatic BIOS fan control for the associated fan and set it to maximum speed. Enabling BIOS fan control again can be achieved by writing ``2`` into this attribute. Reading this sysfs attributes returns the current setting as reported by the underlying hardware.h](h;When using the first method, each fan will have a standard }(hj[ hhhNhNubj,)}(h``pwmX_enable``h]h pwmX_enable}(hjc hhhNhNubah}(h]h ]h"]h$]h&]uh1j+hj[ ubh sysfs attribute. Writing }(hj[ hhhNhNubj,)}(h``1``h]h1}(hju hhhNhNubah}(h]h ]h"]h$]h&]uh1j+hj[ ubh into this attribute will disable automatic BIOS fan control for the associated fan and set it to maximum speed. Enabling BIOS fan control again can be achieved by writing }(hj[ hhhNhNubj,)}(h``2``h]h2}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1j+hj[ ubhw into this attribute. Reading this sysfs attributes returns the current setting as reported by the underlying hardware.}(hj[ hhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhKEhj hhubj)}(hX<When using the second method however, only the ``pwm1_enable`` sysfs attribute will be available to enable/disable automatic BIOS fan control globaly for all fans available on a given device. Additionally, this sysfs attribute is write-only as there exists no SMM command for reading the current fan control setting.h](h/When using the second method however, only the }(hj hhhNhNubj,)}(h``pwm1_enable``h]h pwm1_enable}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1j+hj ubh sysfs attribute will be available to enable/disable automatic BIOS fan control globaly for all fans available on a given device. Additionally, this sysfs attribute is write-only as there exists no SMM command for reading the current fan control setting.}(hj hhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhKLhj hhubj)}(hXUIf no ``pwmX_enable`` attributes are available, then it means that the driver cannot use the first method and the SMM codes for enabling and disabling automatic BIOS fan control are not whitelisted for your device. It is possible that codes that work for other laptops actually work for yours as well, or that you have to discover new codes.h](hIf no }(hj hhhNhNubj,)}(h``pwmX_enable``h]h pwmX_enable}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1j+hj ubhX@ attributes are available, then it means that the driver cannot use the first method and the SMM codes for enabling and disabling automatic BIOS fan control are not whitelisted for your device. It is possible that codes that work for other laptops actually work for yours as well, or that you have to discover new codes.}(hj hhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhKQhj hhubj)}(hXCheck the list ``i8k_whitelist_fan_control`` in file ``drivers/hwmon/dell-smm-hwmon.c`` in the kernel tree: as a first attempt you can try to add your machine and use an already-known code pair. If, after recompiling the kernel, you see that ``pwm1_enable`` is present and works (i.e., you can manually control the fan speed), then please submit your finding as a kernel patch, so that other users can benefit from it. Please see :ref:`Documentation/process/submitting-patches.rst ` for information on submitting patches.h](hCheck the list }(hj hhhNhNubj,)}(h``i8k_whitelist_fan_control``h]hi8k_whitelist_fan_control}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1j+hj ubh in file }(hj hhhNhNubj,)}(h"``drivers/hwmon/dell-smm-hwmon.c``h]hdrivers/hwmon/dell-smm-hwmon.c}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1j+hj ubh in the kernel tree: as a first attempt you can try to add your machine and use an already-known code pair. If, after recompiling the kernel, you see that }(hj hhhNhNubj,)}(h``pwm1_enable``h]h pwm1_enable}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1j+hj ubh is present and works (i.e., you can manually control the fan speed), then please submit your finding as a kernel patch, so that other users can benefit from it. Please see }(hj hhhNhNubh)}(hG:ref:`Documentation/process/submitting-patches.rst `h]hinline)}(hj h]h,Documentation/process/submitting-patches.rst}(hj# hhhNhNubah}(h]h ](xrefstdstd-refeh"]h$]h&]uh1j! hj ubah}(h]h ]h"]h$]h&]refdochwmon/dell-smm-hwmon refdomainj. reftyperef refexplicitrefwarn reftargetsubmittingpatchesuh1hhhhKWhj ubh' for information on submitting patches.}(hj hhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhKWhj hhubj)}(hXIf no known code works on your machine, you need to resort to do some probing, because unfortunately Dell does not publish datasheets for its SMM. You can experiment with the code in `this repository`__ to probe the BIOS on your machine and discover the appropriate codes.h](hIf no known code works on your machine, you need to resort to do some probing, because unfortunately Dell does not publish datasheets for its SMM. You can experiment with the code in }(hjL hhhNhNubj)}(h`this repository`__h]hthis repository}(hjT hhhNhNubah}(h]h ]h"]h$]h&]namethis repositoryjOKjP"https://github.com/clopez/dellfan/uh1jhjL jRKubhF to probe the BIOS on your machine and discover the appropriate codes.}(hjL hhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhKahj hhubjp)}(h&__ https://github.com/clopez/dellfan/ h]jv)}(h%__ https://github.com/clopez/dellfan/h]h}(h]id2ah ]h"]h$]h&]jPjd jOKuh1juhKhjo jKubah}(h]h ]h"]h$]h&]uh1johhhKfhj hhubj)}(hCAgain, when you find new codes, we'd be happy to have your patches!h]hEAgain, when you find new codes, we’d be happy to have your patches!}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhhj hhubeh}(h]-enabling-disabling-automatic-bios-fan-controlah ]h"]-enabling/disabling automatic bios fan controlah$]h&]uh1j[hj]hhhhhK5ubj\)}(hhh](ja)}(h``thermal`` interfaceh](j,)}(h ``thermal``h]hthermal}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1j+hj ubh interface}(hj hhhNhNubeh}(h]h ]h"]h$]h&]uh1j`hj hhhhhKkubj)}(hThe driver also exports the fans as thermal cooling devices with ``type`` set to ``dell-smm-fan[1-4]``. This allows for easy fan control using one of the thermal governors.h](hAThe driver also exports the fans as thermal cooling devices with }(hj hhhNhNubj,)}(h``type``h]htype}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1j+hj ubh set to }(hj hhhNhNubj,)}(h``dell-smm-fan[1-4]``h]hdell-smm-fan[1-4]}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1j+hj ubhF. This allows for easy fan control using one of the thermal governors.}(hj hhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhKmhj hhubeh}(h]thermal-interfaceah ]h"]thermal interfaceah$]h&]uh1j[hj]hhhhhKkubj\)}(hhh](ja)}(hModule parametersh]hModule parameters}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1j`hj hhhhhKrubj )}(hhh](j )}(hoforce:bool Force loading without checking for supported models. (default: 0) h]hdefinition_list)}(hhh]hdefinition_list_item)}(hMforce:bool Force loading without checking for supported models. (default: 0) h](hterm)}(h force:boolh]h force:bool}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1j hhhKvhj ubh definition)}(hhh]j)}(hAForce loading without checking for supported models. (default: 0)h]hAForce loading without checking for supported models. (default: 0)}(hj+ hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKuhj( ubah}(h]h ]h"]h$]h&]uh1j& hj ubeh}(h]h ]h"]h$]h&]uh1j hhhKvhj ubah}(h]h ]h"]h$]h&]uh1j hj ubah}(h]h ]h"]h$]h&]uh1j hj hhhNhNubj )}(hzignore_dmi:bool Continue probing hardware even if DMI data does not match. (default: 0) h]j )}(hhh]j )}(hXignore_dmi:bool Continue probing hardware even if DMI data does not match. (default: 0) h](j )}(hignore_dmi:boolh]hignore_dmi:bool}(hj\ hhhNhNubah}(h]h ]h"]h$]h&]uh1j hhhKzhjX ubj' )}(hhh]j)}(hGContinue probing hardware even if DMI data does not match. (default: 0)h]hGContinue probing hardware even if DMI data does not match. (default: 0)}(hjm hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKyhjj ubah}(h]h ]h"]h$]h&]uh1j& hjX ubeh}(h]h ]h"]h$]h&]uh1j hhhKzhjU ubah}(h]h ]h"]h$]h&]uh1j hjQ ubah}(h]h ]h"]h$]h&]uh1j hj hhhNhNubj )}(hX=restricted:bool Allow fan control only to processes with the ``CAP_SYS_ADMIN`` capability set or processes run as root when using the legacy ``/proc/i8k`` interface. In this case normal users will be able to read temperature and fan status but not to control the fan. If your notebook is shared with other users and you don't trust them you may want to use this option. (default: 1, only available with ``CONFIG_I8K``) h]j )}(hhh]j )}(hXrestricted:bool Allow fan control only to processes with the ``CAP_SYS_ADMIN`` capability set or processes run as root when using the legacy ``/proc/i8k`` interface. In this case normal users will be able to read temperature and fan status but not to control the fan. If your notebook is shared with other users and you don't trust them you may want to use this option. (default: 1, only available with ``CONFIG_I8K``) h](j )}(hrestricted:boolh]hrestricted:bool}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1j hhhKhj ubj' )}(hhh]j)}(hXAllow fan control only to processes with the ``CAP_SYS_ADMIN`` capability set or processes run as root when using the legacy ``/proc/i8k`` interface. In this case normal users will be able to read temperature and fan status but not to control the fan. If your notebook is shared with other users and you don't trust them you may want to use this option. (default: 1, only available with ``CONFIG_I8K``)h](h-Allow fan control only to processes with the }(hj hhhNhNubj,)}(h``CAP_SYS_ADMIN``h]h CAP_SYS_ADMIN}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1j+hj ubh? capability set or processes run as root when using the legacy }(hj hhhNhNubj,)}(h ``/proc/i8k``h]h /proc/i8k}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1j+hj ubh interface. In this case normal users will be able to read temperature and fan status but not to control the fan. If your notebook is shared with other users and you don’t trust them you may want to use this option. (default: 1, only available with }(hj hhhNhNubj,)}(h``CONFIG_I8K``h]h CONFIG_I8K}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1j+hj ubh)}(hj hhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhK}hj ubah}(h]h ]h"]h$]h&]uh1j& hj ubeh}(h]h ]h"]h$]h&]uh1j hhhKhj ubah}(h]h ]h"]h$]h&]uh1j hj ubah}(h]h ]h"]h$]h&]uh1j hj hhhNhNubj )}(hpower_status:bool Report AC status in ``/proc/i8k``. (default: 0, only available with ``CONFIG_I8K``) h]j )}(hhh]j )}(hfpower_status:bool Report AC status in ``/proc/i8k``. (default: 0, only available with ``CONFIG_I8K``) h](j )}(hpower_status:boolh]hpower_status:bool}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j hhhKhjubj' )}(hhh]j)}(hSReport AC status in ``/proc/i8k``. (default: 0, only available with ``CONFIG_I8K``)h](hReport AC status in }(hj'hhhNhNubj,)}(h ``/proc/i8k``h]h /proc/i8k}(hj/hhhNhNubah}(h]h ]h"]h$]h&]uh1j+hj'ubh#. (default: 0, only available with }(hj'hhhNhNubj,)}(h``CONFIG_I8K``h]h CONFIG_I8K}(hjAhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hj'ubh)}(hj'hhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhKhj$ubah}(h]h ]h"]h$]h&]uh1j& hjubeh}(h]h ]h"]h$]h&]uh1j hhhKhjubah}(h]h ]h"]h$]h&]uh1j hj ubah}(h]h ]h"]h$]h&]uh1j hj hhhNhNubj )}(hifan_mult:uint Factor to multiply fan speed with. (default: autodetect) h]j )}(hhh]j )}(hGfan_mult:uint Factor to multiply fan speed with. (default: autodetect) h](j )}(h fan_mult:uinth]h fan_mult:uint}(hj|hhhNhNubah}(h]h ]h"]h$]h&]uh1j hhhKhjxubj' )}(hhh]j)}(h8Factor to multiply fan speed with. (default: autodetect)h]h8Factor to multiply fan speed with. (default: autodetect)}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjubah}(h]h ]h"]h$]h&]uh1j& hjxubeh}(h]h ]h"]h$]h&]uh1j hhhKhjuubah}(h]h ]h"]h$]h&]uh1j hjqubah}(h]h ]h"]h$]h&]uh1j hj hhhNhNubj )}(hefan_max:uint Maximum configurable fan speed. (default: autodetect) h]j )}(hhh]j )}(hCfan_max:uint Maximum configurable fan speed. (default: autodetect) h](j )}(h fan_max:uinth]h fan_max:uint}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j hhhKhjubj' )}(hhh]j)}(h5Maximum configurable fan speed. (default: autodetect)h]h5Maximum configurable fan speed. (default: autodetect)}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjubah}(h]h ]h"]h$]h&]uh1j& hjubeh}(h]h ]h"]h$]h&]uh1j hhhKhjubah}(h]h ]h"]h$]h&]uh1j hjubah}(h]h ]h"]h$]h&]uh1j hj hhhNhNubeh}(h]h ]h"]h$]h&]jY *uh1j hhhKthj hhubeh}(h]module-parametersah ]h"]module parametersah$]h&]uh1j[hj]hhhhhKrubj\)}(hhh](ja)}(hLegacy ``/proc`` interfaceh](hLegacy }(hjhhhNhNubj,)}(h ``/proc``h]h/proc}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubh interface}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1j`hjhhhhhKubhwarning)}(hThis interface is obsolete and deprecated and should not used in new applications. This interface is only available when kernel is compiled with option ``CONFIG_I8K``.h]j)}(hThis interface is obsolete and deprecated and should not used in new applications. This interface is only available when kernel is compiled with option ``CONFIG_I8K``.h](hThis interface is obsolete and deprecated and should not used in new applications. This interface is only available when kernel is compiled with option }(hj-hhhNhNubj,)}(h``CONFIG_I8K``h]h CONFIG_I8K}(hj5hhhNhNubah}(h]h ]h"]h$]h&]uh1j+hj-ubh.}(hj-hhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhKhj)ubah}(h]h ]h"]h$]h&]uh1j'hjhhhhhNubj)}(huThe information provided by the kernel driver can be accessed by simply reading the ``/proc/i8k`` file. For example::h](hTThe information provided by the kernel driver can be accessed by simply reading the }(hjShhhNhNubj,)}(h ``/proc/i8k``h]h /proc/i8k}(hj[hhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjSubh file. For example:}(hjShhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhKhjhhubh literal_block)}(h4$ cat /proc/i8k 1.0 A17 2J59L02 52 2 1 8040 6420 1 2h]h4$ cat /proc/i8k 1.0 A17 2J59L02 52 2 1 8040 6420 1 2}hjusbah}(h]h ]h"]h$]h&]hhuh1jshhhKhjhhubj)}(h(The fields read from ``/proc/i8k`` are::h](hThe fields read from }(hjhhhNhNubj,)}(h ``/proc/i8k``h]h /proc/i8k}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubh are:}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhKhjhhubjt)}(hX1.0 A17 2J59L02 52 2 1 8040 6420 1 2 | | | | | | | | | | | | | | | | | | | +------- 10. buttons status | | | | | | | | +--------- 9. AC status | | | | | | | +-------------- 8. fan0 RPM | | | | | | +------------------- 7. fan1 RPM | | | | | +--------------------- 6. fan0 status | | | | +----------------------- 5. fan1 status | | | +-------------------------- 4. temp0 reading (Celsius) | | +---------------------------------- 3. Dell service tag (later known as 'serial number') | +-------------------------------------- 2. BIOS version +------------------------------------------ 1. /proc/i8k format versionh]hX1.0 A17 2J59L02 52 2 1 8040 6420 1 2 | | | | | | | | | | | | | | | | | | | +------- 10. buttons status | | | | | | | | +--------- 9. AC status | | | | | | | +-------------- 8. fan0 RPM | | | | | | +------------------- 7. fan1 RPM | | | | | +--------------------- 6. fan0 status | | | | +----------------------- 5. fan1 status | | | +-------------------------- 4. temp0 reading (Celsius) | | +---------------------------------- 3. Dell service tag (later known as 'serial number') | +-------------------------------------- 2. BIOS version +------------------------------------------ 1. /proc/i8k format version}hjsbah}(h]h ]h"]h$]h&]hhuh1jshhhKhjhhubj)}(hA negative value, for example -22, indicates that the BIOS doesn't return the corresponding information. This is normal on some models/BIOSes.h]hA negative value, for example -22, indicates that the BIOS doesn’t return the corresponding information. This is normal on some models/BIOSes.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjhhubj)}(hXcFor performance reasons the ``/proc/i8k`` doesn't report by default the AC status since this SMM call takes a long time to execute and is not really needed. If you want to see the ac status in ``/proc/i8k`` you must explictitly enable this option by passing the ``power_status=1`` parameter to insmod. If AC status is not available -1 is printed instead.h](hFor performance reasons the }(hjhhhNhNubj,)}(h ``/proc/i8k``h]h /proc/i8k}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubh doesn’t report by default the AC status since this SMM call takes a long time to execute and is not really needed. If you want to see the ac status in }(hjhhhNhNubj,)}(h ``/proc/i8k``h]h /proc/i8k}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubh8 you must explictitly enable this option by passing the }(hjhhhNhNubj,)}(h``power_status=1``h]hpower_status=1}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubhJ parameter to insmod. If AC status is not available -1 is printed instead.}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhKhjhhubj)}(hX3The driver provides also an ioctl interface which can be used to obtain the same information and to control the fan status. The ioctl interface can be accessed from C programs or from shell using the i8kctl utility. See the source file of ``i8kutils`` for more information on how to use the ioctl interface.h](hThe driver provides also an ioctl interface which can be used to obtain the same information and to control the fan status. The ioctl interface can be accessed from C programs or from shell using the i8kctl utility. See the source file of }(hjhhhNhNubj,)}(h ``i8kutils``h]hi8kutils}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubh8 for more information on how to use the ioctl interface.}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhKhjhhubeh}(h]legacy-proc-interfaceah ]h"]legacy /proc interfaceah$]h&]uh1j[hj]hhhhhKubj\)}(hhh](ja)}(h SMM Interfaceh]h SMM Interface}(hj.hhhNhNubah}(h]h ]h"]h$]h&]uh1j`hj+hhhhhKubj()}(hThe SMM interface was reverse-engineered by trial-and-error since Dell did not provide any Documentation, please keep that in mind.h]j)}(hThe SMM interface was reverse-engineered by trial-and-error since Dell did not provide any Documentation, please keep that in mind.h]hThe SMM interface was reverse-engineered by trial-and-error since Dell did not provide any Documentation, please keep that in mind.}(hj@hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhj<ubah}(h]h ]h"]h$]h&]uh1j'hj+hhhhhNubj)}(hXThe driver uses the SMM interface to send commands to the system BIOS. This interface is normally used by Dell's 32-bit diagnostic program or on newer notebook models by the buildin BIOS diagnostics. The SMM may cause short hangs when the BIOS code is taking too long to execute.h]hXThe driver uses the SMM interface to send commands to the system BIOS. This interface is normally used by Dell’s 32-bit diagnostic program or on newer notebook models by the buildin BIOS diagnostics. The SMM may cause short hangs when the BIOS code is taking too long to execute.}(hjThhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhj+hhubj)}(hThe SMM handler inside the system BIOS looks at the contents of the ``eax``, ``ebx``, ``ecx``, ``edx``, ``esi`` and ``edi`` registers. Each register has a special purpose:h](hDThe SMM handler inside the system BIOS looks at the contents of the }(hjbhhhNhNubj,)}(h``eax``h]heax}(hjjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjbubh, }(hjbhhhNhNubj,)}(h``ebx``h]hebx}(hj|hhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjbubh, }hjbsbj,)}(h``ecx``h]hecx}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjbubh, }hjbsbj,)}(h``edx``h]hedx}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjbubh, }hjbsbj,)}(h``esi``h]hesi}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjbubh and }(hjbhhhNhNubj,)}(h``edi``h]hedi}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjbubh0 registers. Each register has a special purpose:}(hjbhhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhKhj+hhubj=)}(hhh]jB)}(hhh](jG)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jFhjubjG)}(hhh]h}(h]h ]h"]h$]h&]colwidthK"uh1jFhjubjg)}(hhh]jl)}(hhh](jq)}(hhh]j)}(hRegisterh]hRegister}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjubah}(h]h ]h"]h$]h&]uh1jphjubjq)}(hhh]j)}(hPurposeh]hPurpose}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjubah}(h]h ]h"]h$]h&]uh1jphjubeh}(h]h ]h"]h$]h&]uh1jkhjubah}(h]h ]h"]h$]h&]uh1jfhjubj)}(hhh](jl)}(hhh](jq)}(hhh]j)}(heaxh]heax}(hj?hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhj<ubah}(h]h ]h"]h$]h&]uh1jphj9ubjq)}(hhh]j)}(hDHolds the command code before SMM, holds the first result after SMM.h]hDHolds the command code before SMM, holds the first result after SMM.}(hjVhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjSubah}(h]h ]h"]h$]h&]uh1jphj9ubeh}(h]h ]h"]h$]h&]uh1jkhj6ubjl)}(hhh](jq)}(hhh]j)}(hebxh]hebx}(hjvhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjsubah}(h]h ]h"]h$]h&]uh1jphjpubjq)}(hhh]j)}(hHolds the arguments.h]hHolds the arguments.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjubah}(h]h ]h"]h$]h&]uh1jphjpubeh}(h]h ]h"]h$]h&]uh1jkhj6ubjl)}(hhh](jq)}(hhh]j)}(hecxh]hecx}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjubah}(h]h ]h"]h$]h&]uh1jphjubjq)}(hhh]j)}(hUnknown, set to 0.h]hUnknown, set to 0.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjubah}(h]h ]h"]h$]h&]uh1jphjubeh}(h]h ]h"]h$]h&]uh1jkhj6ubjl)}(hhh](jq)}(hhh]j)}(hedxh]hedx}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjubah}(h]h ]h"]h$]h&]uh1jphjubjq)}(hhh]j)}(h"Holds the second result after SMM.h]h"Holds the second result after SMM.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjubah}(h]h ]h"]h$]h&]uh1jphjubeh}(h]h ]h"]h$]h&]uh1jkhj6ubjl)}(hhh](jq)}(hhh]j)}(hesih]hesi}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjubah}(h]h ]h"]h$]h&]uh1jphjubjq)}(hhh]j)}(hUnknown, set to 0.h]hUnknown, set to 0.}(hj2hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhj/ubah}(h]h ]h"]h$]h&]uh1jphjubeh}(h]h ]h"]h$]h&]uh1jkhj6ubjl)}(hhh](jq)}(hhh]j)}(hedih]hedi}(hjRhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjOubah}(h]h ]h"]h$]h&]uh1jphjLubjq)}(hhh]j)}(hUnknown, set to 0.h]hUnknown, set to 0.}(hjihhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjfubah}(h]h ]h"]h$]h&]uh1jphjLubeh}(h]h ]h"]h$]h&]uh1jkhj6ubeh}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]colsKuh1jAhjubah}(h]h ]h"]h$]h&]uh1j<hj+hhhhhNubj)}(h/The SMM handler can signal a failure by either:h]h/The SMM handler can signal a failure by either:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhj+hhubj )}(hhh](j )}(h7setting the lower sixteen bits of ``eax`` to ``0xffff``h]j)}(hjh](h"setting the lower sixteen bits of }(hjhhhNhNubj,)}(h``eax``h]heax}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubh to }(hjhhhNhNubj,)}(h ``0xffff``h]h0xffff}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubeh}(h]h ]h"]h$]h&]uh1jhhhKhjubah}(h]h ]h"]h$]h&]uh1j hjhhhhhNubj )}(hnot modifying ``eax`` at allh]j)}(hjh](hnot modifying }(hjhhhNhNubj,)}(h``eax``h]heax}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubh at all}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhKhjubah}(h]h ]h"]h$]h&]uh1j hjhhhhhNubj )}(h3setting the carry flag (legacy SMM interface only) h]j)}(h2setting the carry flag (legacy SMM interface only)h]h2setting the carry flag (legacy SMM interface only)}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjubah}(h]h ]h"]h$]h&]uh1j hjhhhhhNubeh}(h]h ]h"]h$]h&]jY jZ uh1j hhhKhj+hhubeh}(h] smm-interfaceah ]h"] smm interfaceah$]h&]uh1j[hj]hhhhhKubj\)}(hhh](ja)}(hLegacy SMM Interfaceh]hLegacy SMM Interface}(hj0hhhNhNubah}(h]h ]h"]h$]h&]uh1j`hj-hhhhhKubj)}(hXWhen using the legacy SMM interface, a SMM is triggered by writing the least significant byte of the command code to the special ioports ``0xb2`` and ``0x84``. This interface is not described inside the ACPI tables and can thus only be detected by issuing a test SMM call.h](hWhen using the legacy SMM interface, a SMM is triggered by writing the least significant byte of the command code to the special ioports }(hj>hhhNhNubj,)}(h``0xb2``h]h0xb2}(hjFhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hj>ubh and }(hj>hhhNhNubj,)}(h``0x84``h]h0x84}(hjXhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hj>ubhr. This interface is not described inside the ACPI tables and can thus only be detected by issuing a test SMM call.}(hj>hhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhKhj-hhubeh}(h]legacy-smm-interfaceah ]h"]legacy smm interfaceah$]h&]uh1j[hj]hhhhhKubj\)}(hhh](ja)}(hWMI SMM Interfaceh]hWMI SMM Interface}(hj{hhhNhNubah}(h]h ]h"]h$]h&]uh1j`hjxhhhhhKubj)}(h>On modern Dell machines, the SMM calls are done over ACPI WMI:h]h>On modern Dell machines, the SMM calls are done over ACPI WMI:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjxhhubjt)}(hX#pragma namespace("\\\\.\\root\\dcim\\sysman\\diagnostics") [WMI, Provider("Provider_DiagnosticsServices"), Dynamic, Locale("MS\\0x409"), Description("RunDellDiag"), guid("{F1DDEE52-063C-4784-A11E-8A06684B9B01}")] class LegacyDiags { [key, read] string InstanceName; [read] boolean Active; [WmiMethodId(1), Implemented, read, write, Description("Legacy Method ")] void Execute([in, out] uint32 EaxLen, [in, out, WmiSizeIs("EaxLen") : ToInstance] uint8 EaxVal[], [in, out] uint32 EbxLen, [in, out, WmiSizeIs("EbxLen") : ToInstance] uint8 EbxVal[], [in, out] uint32 EcxLen, [in, out, WmiSizeIs("EcxLen") : ToInstance] uint8 EcxVal[], [in, out] uint32 EdxLen, [in, out, WmiSizeIs("EdxLen") : ToInstance] uint8 EdxVal[]); };h]hX#pragma namespace("\\\\.\\root\\dcim\\sysman\\diagnostics") [WMI, Provider("Provider_DiagnosticsServices"), Dynamic, Locale("MS\\0x409"), Description("RunDellDiag"), guid("{F1DDEE52-063C-4784-A11E-8A06684B9B01}")] class LegacyDiags { [key, read] string InstanceName; [read] boolean Active; [WmiMethodId(1), Implemented, read, write, Description("Legacy Method ")] void Execute([in, out] uint32 EaxLen, [in, out, WmiSizeIs("EaxLen") : ToInstance] uint8 EaxVal[], [in, out] uint32 EbxLen, [in, out, WmiSizeIs("EbxLen") : ToInstance] uint8 EbxVal[], [in, out] uint32 EcxLen, [in, out, WmiSizeIs("EcxLen") : ToInstance] uint8 EcxVal[], [in, out] uint32 EdxLen, [in, out, WmiSizeIs("EdxLen") : ToInstance] uint8 EdxVal[]); };}hjsbah}(h]h ]h"]h$]h&]hhuh1jshhhKhjxhhubj)}(hXqSome machines support only the WMI SMM interface, while some machines support both interfaces. The driver automatically detects which interfaces are present and will use the WMI SMM interface if the legacy SMM interface is not present. The WMI SMM interface is usually slower than the legacy SMM interface since ACPI methods need to be called in order to trigger a SMM.h]hXqSome machines support only the WMI SMM interface, while some machines support both interfaces. The driver automatically detects which interfaces are present and will use the WMI SMM interface if the legacy SMM interface is not present. The WMI SMM interface is usually slower than the legacy SMM interface since ACPI methods need to be called in order to trigger a SMM.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjxhhubeh}(h]wmi-smm-interfaceah ]h"]wmi smm interfaceah$]h&]uh1j[hj]hhhhhKubj\)}(hhh](ja)}(hSMM command codesh]hSMM command codes}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j`hjhhhhhMubj=)}(hhh]jB)}(hhh](jG)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jFhjubjG)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jFhjubjG)}(hhh]h}(h]h ]h"]h$]h&]colwidthK0uh1jFhjubjg)}(hhh]jl)}(hhh](jq)}(hhh]j)}(h Command Codeh]h Command Code}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjubah}(h]h ]h"]h$]h&]uh1jphjubjq)}(hhh]j)}(h Command Nameh]h Command Name}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj ubah}(h]h ]h"]h$]h&]uh1jphjubjq)}(hhh]j)}(h Descriptionh]h Description}(hj'hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj$ubah}(h]h ]h"]h$]h&]uh1jphjubeh}(h]h ]h"]h$]h&]uh1jkhjubah}(h]h ]h"]h$]h&]uh1jfhjubj)}(hhh](jl)}(hhh](jq)}(hhh]j)}(h ``0x0025``h]j,)}(hjRh]h0x0025}(hjThhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjPubah}(h]h ]h"]h$]h&]uh1jhhhM hjMubah}(h]h ]h"]h$]h&]uh1jphjJubjq)}(hhh]j)}(hGet Fn key statush]hGet Fn key status}(hjphhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjmubah}(h]h ]h"]h$]h&]uh1jphjJubjq)}(hhh](j)}(h%Returns the Fn key pressed after SMM:h]h%Returns the Fn key pressed after SMM:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjubj )}(hhh](j )}(h&9th bit in ``eax`` indicates Volume uph]j)}(hjh](h 9th bit in }(hjhhhNhNubj,)}(h``eax``h]heax}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubh indicates Volume up}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhM hjubah}(h]h ]h"]h$]h&]uh1j hjubj )}(h)10th bit in ``eax`` indicates Volume downh]j)}(hjh](h 10th bit in }(hjhhhNhNubj,)}(h``eax``h]heax}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubh indicates Volume down}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhMhjubah}(h]h ]h"]h$]h&]uh1j hjubj )}(hboth bits indicate Volume mute h]j)}(hboth bits indicate Volume muteh]hboth bits indicate Volume mute}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubah}(h]h ]h"]h$]h&]uh1j hjubeh}(h]h ]h"]h$]h&]jY jZ uh1j hhhM hjubeh}(h]h ]h"]h$]h&]uh1jphjJubeh}(h]h ]h"]h$]h&]uh1jkhjGubjl)}(hhh](jq)}(hhh]j)}(h ``0xa069``h]j,)}(hjh]h0xa069}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubah}(h]h ]h"]h$]h&]uh1jhhhMhjubah}(h]h ]h"]h$]h&]uh1jphjubjq)}(hhh]j)}(hGet power statush]hGet power status}(hj:hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj7ubah}(h]h ]h"]h$]h&]uh1jphjubjq)}(hhh](j)}(h'Returns current power status after SMM:h]h'Returns current power status after SMM:}(hjQhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjNubj )}(hhh](j )}(h.1st bit in ``eax`` indicates Battery connectedh]j)}(hjdh](h 1st bit in }(hjfhhhNhNubj,)}(h``eax``h]heax}(hjmhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjfubh indicates Battery connected}(hjfhhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhMhjbubah}(h]h ]h"]h$]h&]uh1j hj_ubj )}(h*3th bit in ``eax`` indicates AC connected h]j)}(h)3th bit in ``eax`` indicates AC connectedh](h 3th bit in }(hjhhhNhNubj,)}(h``eax``h]heax}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubh indicates AC connected}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhMhjubah}(h]h ]h"]h$]h&]uh1j hj_ubeh}(h]h ]h"]h$]h&]jY jZ uh1j hhhMhjNubeh}(h]h ]h"]h$]h&]uh1jphjubeh}(h]h ]h"]h$]h&]uh1jkhjGubjl)}(hhh](jq)}(hhh]j)}(h ``0x00a3``h]j,)}(hjh]h0x00a3}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubah}(h]h ]h"]h$]h&]uh1jhhhMhjubah}(h]h ]h"]h$]h&]uh1jphjubjq)}(hhh]j)}(h Get fan stateh]h Get fan state}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubah}(h]h ]h"]h$]h&]uh1jphjubjq)}(hhh](j)}(h$Returns current fan state after SMM:h]h$Returns current fan state after SMM:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubj )}(hhh]j )}(h=1st byte in ``eax`` holds the current fan state (0 - 2 or 3) h]j)}(h<1st byte in ``eax`` holds the current fan state (0 - 2 or 3)h](h 1st byte in }(hjhhhNhNubj,)}(h``eax``h]heax}(hj!hhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubh) holds the current fan state (0 - 2 or 3)}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhMhjubah}(h]h ]h"]h$]h&]uh1j hjubah}(h]h ]h"]h$]h&]jY jZ uh1j hhhMhjubeh}(h]h ]h"]h$]h&]uh1jphjubeh}(h]h ]h"]h$]h&]uh1jkhjGubjl)}(hhh](jq)}(hhh]j)}(h ``0x01a3``h]j,)}(hjYh]h0x01a3}(hj[hhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjWubah}(h]h ]h"]h$]h&]uh1jhhhMhjTubah}(h]h ]h"]h$]h&]uh1jphjQubjq)}(hhh]j)}(h Set fan stateh]h Set fan state}(hjwhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjtubah}(h]h ]h"]h$]h&]uh1jphjQubjq)}(hhh](j)}(hSets the fan speed:h]hSets the fan speed:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubj )}(hhh](j )}(h(1st byte in ``ebx`` holds the fan numberh]j)}(hjh](h 1st byte in }(hjhhhNhNubj,)}(h``ebx``h]hebx}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubh holds the fan number}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhMhjubah}(h]h ]h"]h$]h&]uh1j hjubj )}(h=2nd byte in ``ebx`` holds the desired fan state (0 - 2 or 3) h]j)}(h<2nd byte in ``ebx`` holds the desired fan state (0 - 2 or 3)h](h 2nd byte in }(hjhhhNhNubj,)}(h``ebx``h]hebx}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubh) holds the desired fan state (0 - 2 or 3)}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhMhjubah}(h]h ]h"]h$]h&]uh1j hjubeh}(h]h ]h"]h$]h&]jY jZ uh1j hhhMhjubeh}(h]h ]h"]h$]h&]uh1jphjQubeh}(h]h ]h"]h$]h&]uh1jkhjGubjl)}(hhh](jq)}(hhh]j)}(h ``0x02a3``h]j,)}(hj h]h0x02a3}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hj ubah}(h]h ]h"]h$]h&]uh1jhhhM!hjubah}(h]h ]h"]h$]h&]uh1jphjubjq)}(hhh]j)}(h Get fan speedh]h Get fan speed}(hj*hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM!hj'ubah}(h]h ]h"]h$]h&]uh1jphjubjq)}(hhh](j)}(h%Returns the current fan speed in RPM:h]h%Returns the current fan speed in RPM:}(hjAhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM!hj>ubj )}(hhh](j )}(h(1st byte in ``ebx`` holds the fan numberh]j)}(hjTh](h 1st byte in }(hjVhhhNhNubj,)}(h``ebx``h]hebx}(hj]hhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjVubh holds the fan number}(hjVhhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhM#hjRubah}(h]h ]h"]h$]h&]uh1j hjOubj )}(hC1st word in ``eax`` holds the current fan speed in RPM (after SMM) h]j)}(hB1st word in ``eax`` holds the current fan speed in RPM (after SMM)h](h 1st word in }(hjhhhNhNubj,)}(h``eax``h]heax}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubh/ holds the current fan speed in RPM (after SMM)}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhM$hj{ubah}(h]h ]h"]h$]h&]uh1j hjOubeh}(h]h ]h"]h$]h&]jY jZ uh1j hhhM#hj>ubeh}(h]h ]h"]h$]h&]uh1jphjubeh}(h]h ]h"]h$]h&]uh1jkhjGubjl)}(hhh](jq)}(hhh]j)}(h ``0x03a3``h]j,)}(hjh]h0x03a3}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubah}(h]h ]h"]h$]h&]uh1jhhhM'hjubah}(h]h ]h"]h$]h&]uh1jphjubjq)}(hhh]j)}(h Get fan typeh]h Get fan type}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM'hjubah}(h]h ]h"]h$]h&]uh1jphjubjq)}(hhh](j)}(hReturns the fan type:h]hReturns the fan type:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM'hjubj )}(hhh](j )}(h(1st byte in ``ebx`` holds the fan numberh]j)}(hjh](h 1st byte in }(hj hhhNhNubj,)}(h``ebx``h]hebx}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hj ubh holds the fan number}(hj hhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhM)hjubah}(h]h ]h"]h$]h&]uh1j hjubj )}(h1st byte in ``eax`` holds the fan type (after SMM): - 5th bit indicates docking fan - 1 indicates Processor fan - 2 indicates Motherboard fan - 3 indicates Video fan - 4 indicates Power supply fan - 5 indicates Chipset fan - 6 indicates other fan type h](j)}(h31st byte in ``eax`` holds the fan type (after SMM):h](h 1st byte in }(hj2hhhNhNubj,)}(h``eax``h]heax}(hj:hhhNhNubah}(h]h ]h"]h$]h&]uh1j+hj2ubh holds the fan type (after SMM):}(hj2hhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhM*hj.ubj )}(hhh](j )}(h5th bit indicates docking fanh]j)}(hjWh]h5th bit indicates docking fan}(hjYhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM-hjUubah}(h]h ]h"]h$]h&]uh1j hjRubj )}(h1 indicates Processor fanh]j)}(hjnh]h1 indicates Processor fan}(hjphhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM.hjlubah}(h]h ]h"]h$]h&]uh1j hjRubj )}(h2 indicates Motherboard fanh]j)}(hjh]h2 indicates Motherboard fan}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM/hjubah}(h]h ]h"]h$]h&]uh1j hjRubj )}(h3 indicates Video fanh]j)}(hjh]h3 indicates Video fan}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM0hjubah}(h]h ]h"]h$]h&]uh1j hjRubj )}(h4 indicates Power supply fanh]j)}(hjh]h4 indicates Power supply fan}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM1hjubah}(h]h ]h"]h$]h&]uh1j hjRubj )}(h5 indicates Chipset fanh]j)}(hjh]h5 indicates Chipset fan}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM2hjubah}(h]h ]h"]h$]h&]uh1j hjRubj )}(h6 indicates other fan type h]j)}(h6 indicates other fan typeh]h6 indicates other fan type}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM3hjubah}(h]h ]h"]h$]h&]uh1j hjRubeh}(h]h ]h"]h$]h&]jY jZ uh1j hhhM-hj.ubeh}(h]h ]h"]h$]h&]uh1j hjubeh}(h]h ]h"]h$]h&]jY jZ uh1j hhhM)hjubeh}(h]h ]h"]h$]h&]uh1jphjubeh}(h]h ]h"]h$]h&]uh1jkhjGubjl)}(hhh](jq)}(hhh]j)}(h ``0x04a3``h]j,)}(hjh]h0x04a3}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubah}(h]h ]h"]h$]h&]uh1jhhhM5hjubah}(h]h ]h"]h$]h&]uh1jphjubjq)}(hhh]j)}(hGet nominal fan speedh]hGet nominal fan speed}(hj;hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM5hj8ubah}(h]h ]h"]h$]h&]uh1jphjubjq)}(hhh](j)}(h*Returns the nominal RPM in each fan state:h]h*Returns the nominal RPM in each fan state:}(hjRhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM5hjOubj )}(hhh](j )}(h(1st byte in ``ebx`` holds the fan numberh]j)}(hjeh](h 1st byte in }(hjghhhNhNubj,)}(h``ebx``h]hebx}(hjnhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjgubh holds the fan number}(hjghhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhM7hjcubah}(h]h ]h"]h$]h&]uh1j hj`ubj )}(h@2nd byte in ``ebx`` holds the fan state in question (0 - 2 or 3)h]j)}(h@2nd byte in ``ebx`` holds the fan state in question (0 - 2 or 3)h](h 2nd byte in }(hjhhhNhNubj,)}(h``ebx``h]hebx}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubh- holds the fan state in question (0 - 2 or 3)}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhM8hjubah}(h]h ]h"]h$]h&]uh1j hj`ubj )}(hC1st word in ``eax`` holds the nominal fan speed in RPM (after SMM) h]j)}(hB1st word in ``eax`` holds the nominal fan speed in RPM (after SMM)h](h 1st word in }(hjhhhNhNubj,)}(h``eax``h]heax}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubh/ holds the nominal fan speed in RPM (after SMM)}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhM:hjubah}(h]h ]h"]h$]h&]uh1j hj`ubeh}(h]h ]h"]h$]h&]jY jZ uh1j hhhM7hjOubeh}(h]h ]h"]h$]h&]uh1jphjubeh}(h]h ]h"]h$]h&]uh1jkhjGubjl)}(hhh](jq)}(hhh]j)}(h ``0x05a3``h]j,)}(hjh]h0x05a3}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubah}(h]h ]h"]h$]h&]uh1jhhhM=hjubah}(h]h ]h"]h$]h&]uh1jphjubjq)}(hhh]j)}(hGet fan speed toleranceh]hGet fan speed tolerance}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM=hjubah}(h]h ]h"]h$]h&]uh1jphjubjq)}(hhh](j)}(h/Returns the speed tolerance for each fan state:h]h/Returns the speed tolerance for each fan state:}(hj/hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM=hj,ubj )}(hhh](j )}(h(1st byte in ``ebx`` holds the fan numberh]j)}(hjBh](h 1st byte in }(hjDhhhNhNubj,)}(h``ebx``h]hebx}(hjKhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjDubh holds the fan number}(hjDhhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhM?hj@ubah}(h]h ]h"]h$]h&]uh1j hj=ubj )}(h@2nd byte in ``ebx`` holds the fan state in question (0 - 2 or 3)h]j)}(h@2nd byte in ``ebx`` holds the fan state in question (0 - 2 or 3)h](h 2nd byte in }(hjmhhhNhNubj,)}(h``ebx``h]hebx}(hjuhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjmubh- holds the fan state in question (0 - 2 or 3)}(hjmhhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhM@hjiubah}(h]h ]h"]h$]h&]uh1j hj=ubj )}(h01st byte in ``eax`` returns the speed tolerance h]j)}(h/1st byte in ``eax`` returns the speed toleranceh](h 1st byte in }(hjhhhNhNubj,)}(h``eax``h]heax}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubh returns the speed tolerance}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhMBhjubah}(h]h ]h"]h$]h&]uh1j hj=ubeh}(h]h ]h"]h$]h&]jY jZ uh1j hhhM?hj,ubeh}(h]h ]h"]h$]h&]uh1jphjubeh}(h]h ]h"]h$]h&]uh1jkhjGubjl)}(hhh](jq)}(hhh]j)}(h ``0x10a3``h]j,)}(hjh]h0x10a3}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubah}(h]h ]h"]h$]h&]uh1jhhhMEhjubah}(h]h ]h"]h$]h&]uh1jphjubjq)}(hhh]j)}(hGet sensor temperatureh]hGet sensor temperature}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMEhjubah}(h]h ]h"]h$]h&]uh1jphjubjq)}(hhh](j)}(h!Returns the measured temperature:h]h!Returns the measured temperature:}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMEhj ubj )}(hhh](j )}(h+1st byte in ``ebx`` holds the sensor numberh]j)}(hjh](h 1st byte in }(hj!hhhNhNubj,)}(h``ebx``h]hebx}(hj(hhhNhNubah}(h]h ]h"]h$]h&]uh1j+hj!ubh holds the sensor number}(hj!hhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhMGhjubah}(h]h ]h"]h$]h&]uh1j hjubj )}(h?1st byte in ``eax`` holds the measured temperature (after SMM) h]j)}(h>1st byte in ``eax`` holds the measured temperature (after SMM)h](h 1st byte in }(hjJhhhNhNubj,)}(h``eax``h]heax}(hjRhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjJubh+ holds the measured temperature (after SMM)}(hjJhhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhMHhjFubah}(h]h ]h"]h$]h&]uh1j hjubeh}(h]h ]h"]h$]h&]jY jZ uh1j hhhMGhj ubeh}(h]h ]h"]h$]h&]uh1jphjubeh}(h]h ]h"]h$]h&]uh1jkhjGubjl)}(hhh](jq)}(hhh]j)}(h ``0x11a3``h]j,)}(hjh]h0x11a3}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubah}(h]h ]h"]h$]h&]uh1jhhhMKhjubah}(h]h ]h"]h$]h&]uh1jphjubjq)}(hhh]j)}(hGet sensor typeh]hGet sensor type}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMKhjubah}(h]h ]h"]h$]h&]uh1jphjubjq)}(hhh](j)}(hReturns the sensor type:h]hReturns the sensor type:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMKhjubj )}(hhh](j )}(h+1st byte in ``ebx`` holds the sensor numberh]j)}(hjh](h 1st byte in }(hjhhhNhNubj,)}(h``ebx``h]hebx}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubh holds the sensor number}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhMMhjubah}(h]h ]h"]h$]h&]uh1j hjubj )}(h1st byte in ``eax`` holds the temperature type (after SMM): - 1 indicates CPU sensor - 2 indicates GPU sensor - 3 indicates SODIMM sensor - 4 indicates other sensor type - 5 indicates Ambient sensor - 6 indicates other sensor type h](j)}(h;1st byte in ``eax`` holds the temperature type (after SMM):h](h 1st byte in }(hjhhhNhNubj,)}(h``eax``h]heax}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubh( holds the temperature type (after SMM):}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhMNhjubj )}(hhh](j )}(h1 indicates CPU sensorh]j)}(hj"h]h1 indicates CPU sensor}(hj$hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMQhj ubah}(h]h ]h"]h$]h&]uh1j hjubj )}(h2 indicates GPU sensorh]j)}(hj9h]h2 indicates GPU sensor}(hj;hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMRhj7ubah}(h]h ]h"]h$]h&]uh1j hjubj )}(h3 indicates SODIMM sensorh]j)}(hjPh]h3 indicates SODIMM sensor}(hjRhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMShjNubah}(h]h ]h"]h$]h&]uh1j hjubj )}(h4 indicates other sensor typeh]j)}(hjgh]h4 indicates other sensor type}(hjihhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMThjeubah}(h]h ]h"]h$]h&]uh1j hjubj )}(h5 indicates Ambient sensorh]j)}(hj~h]h5 indicates Ambient sensor}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMUhj|ubah}(h]h ]h"]h$]h&]uh1j hjubj )}(h6 indicates other sensor type h]j)}(h6 indicates other sensor typeh]h6 indicates other sensor type}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMVhjubah}(h]h ]h"]h$]h&]uh1j hjubeh}(h]h ]h"]h$]h&]jY jZ uh1j hhhMQhjubeh}(h]h ]h"]h$]h&]uh1j hjubeh}(h]h ]h"]h$]h&]jY jZ uh1j hhhMMhjubeh}(h]h ]h"]h$]h&]uh1jphjubeh}(h]h ]h"]h$]h&]uh1jkhjGubjl)}(hhh](jq)}(hhh]j)}(h ``0xfea3``h]j,)}(hjh]h0xfea3}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubah}(h]h ]h"]h$]h&]uh1jhhhMXhjubah}(h]h ]h"]h$]h&]uh1jphjubjq)}(hhh]j)}(hGet SMM signatureh]hGet SMM signature}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMXhjubah}(h]h ]h"]h$]h&]uh1jphjubjq)}(hhh](j)}(h=Returns Dell signature if interface is supported (after SMM):h]h=Returns Dell signature if interface is supported (after SMM):}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMXhjubj )}(hhh](j )}(h/``eax`` holds 1145651527 (0x44494147 or "DIAG")h]j)}(h/``eax`` holds 1145651527 (0x44494147 or "DIAG")h](j,)}(h``eax``h]heax}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubh, holds 1145651527 (0x44494147 or “DIAG”)}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhM[hjubah}(h]h ]h"]h$]h&]uh1j hjubj )}(h0``edx`` holds 1145392204 (0x44454c4c or "DELL") h]j)}(h/``edx`` holds 1145392204 (0x44454c4c or "DELL")h](j,)}(h``edx``h]hedx}(hjEhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjAubh, holds 1145392204 (0x44454c4c or “DELL”)}(hjAhhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhM]hj=ubah}(h]h ]h"]h$]h&]uh1j hjubeh}(h]h ]h"]h$]h&]jY jZ uh1j hhhM[hjubeh}(h]h ]h"]h$]h&]uh1jphjubeh}(h]h ]h"]h$]h&]uh1jkhjGubjl)}(hhh](jq)}(hhh]j)}(h ``0xffa3``h]j,)}(hj}h]h0xffa3}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hj{ubah}(h]h ]h"]h$]h&]uh1jhhhM`hjxubah}(h]h ]h"]h$]h&]uh1jphjuubjq)}(hhh]j)}(hGet SMM signatureh]hGet SMM signature}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM`hjubah}(h]h ]h"]h$]h&]uh1jphjuubjq)}(hhh]j)}(hSame as ``0xfea3``, check both.h](hSame as }(hjhhhNhNubj,)}(h ``0xfea3``h]h0xfea3}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubh , check both.}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhM`hjubah}(h]h ]h"]h$]h&]uh1jphjuubeh}(h]h ]h"]h$]h&]uh1jkhjGubeh}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]colsKuh1jAhjubah}(h]h ]h"]h$]h&]uh1j<hjhhhhhNubj)}(hThere are additional commands for enabling (``0x31a3`` or ``0x35a3``) and disabling (``0x30a3`` or ``0x34a3``) automatic fan speed control. The commands are however causing severe sideeffects on many machines, so they are not used by default.h](h,There are additional commands for enabling (}(hjhhhNhNubj,)}(h ``0x31a3``h]h0x31a3}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubh or }(hjhhhNhNubj,)}(h ``0x35a3``h]h0x35a3}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubh) and disabling (}(hjhhhNhNubj,)}(h ``0x30a3``h]h0x30a3}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubh or }hjsbj,)}(h ``0x34a3``h]h0x34a3}(hj/hhhNhNubah}(h]h ]h"]h$]h&]uh1j+hjubh) automatic fan speed control. The commands are however causing severe sideeffects on many machines, so they are not used by default.}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhMchjhhubj)}(hXOn several machines (Inspiron 3505, Precision 490, Vostro 1720, ...), the fans supports a 4th "magic" state, which signals the BIOS that automatic fan control should be enabled for a specific fan. However there are also some machines who do support a 4th regular fan state too, but in case of the "magic" state, the nominal RPM reported for this state is a placeholder value, which however is not always detectable.h]hXOn several machines (Inspiron 3505, Precision 490, Vostro 1720, ...), the fans supports a 4th “magic” state, which signals the BIOS that automatic fan control should be enabled for a specific fan. However there are also some machines who do support a 4th regular fan state too, but in case of the “magic” state, the nominal RPM reported for this state is a placeholder value, which however is not always detectable.}(hjGhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhhjhhubeh}(h]smm-command-codesah ]h"]smm command codesah$]h&]uh1j[hj]hhhhhMubj\)}(hhh](ja)}(h Firmware Bugsh]h Firmware Bugs}(hj`hhhNhNubah}(h]h ]h"]h$]h&]uh1j`hj]hhhhhMpubj)}(h2The SMM calls can behave erratic on some machines:h]h2The SMM calls can behave erratic on some machines:}(hjnhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMrhj]hhubj=)}(hhh]jB)}(hhh](jG)}(hhh]h}(h]h ]h"]h$]h&]colwidthK7uh1jFhjubjG)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jFhjubjg)}(hhh]jl)}(hhh](jq)}(hhh]j)}(h Firmware Bugh]h Firmware Bug}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMuhjubah}(h]h ]h"]h$]h&]uh1jphjubjq)}(hhh]j)}(hAffected Machinesh]hAffected Machines}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMuhjubah}(h]h ]h"]h$]h&]uh1jphjubeh}(h]h ]h"]h$]h&]uh1jkhjubah}(h]h ]h"]h$]h&]uh1jfhjubj)}(hhh](jl)}(hhh](jq)}(hhh]j)}(h-Reading of fan states return spurious errors.h]h-Reading of fan states return spurious errors.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMwhjubah}(h]h ]h"]h$]h&]uh1jphjubjq)}(hhh](j)}(h Precision 490h]h Precision 490}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMwhjubj)}(h OptiPlex 7060h]h OptiPlex 7060}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMyhjubeh}(h]h ]h"]h$]h&]uh1jphjubeh}(h]h ]h"]h$]h&]uh1jkhjubjl)}(hhh](jq)}(hhh]j)}(h2Reading of fan types causes erratic fan behaviour.h]h2Reading of fan types causes erratic fan behaviour.}(hj$hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM{hj!ubah}(h]h ]h"]h$]h&]uh1jphjubjq)}(hhh](j)}(hStudio XPS 8000h]hStudio XPS 8000}(hj;hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM{hj8ubj)}(hStudio XPS 8100h]hStudio XPS 8100}(hjIhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM}hj8ubj)}(h Inspiron 580h]h Inspiron 580}(hjWhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj8ubj)}(h Inspiron 3505h]h Inspiron 3505}(hjehhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj8ubeh}(h]h ]h"]h$]h&]uh1jphjubeh}(h]h ]h"]h$]h&]uh1jkhjubjl)}(hhh](jq)}(hhh]j)}(h2Fan-related SMM calls take too long (about 500ms).h]h2Fan-related SMM calls take too long (about 500ms).}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubah}(h]h ]h"]h$]h&]uh1jphjubjq)}(hhh](j)}(h Inspiron 7720h]h Inspiron 7720}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubj)}(h Vostro 3360h]h Vostro 3360}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubj)}(h XPS 13 9333h]h XPS 13 9333}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubj)}(h XPS 15 L502Xh]h XPS 15 L502X}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubeh}(h]h ]h"]h$]h&]uh1jphjubeh}(h]h ]h"]h$]h&]uh1jkhjubeh}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]colsKuh1jAhj|ubah}(h]h ]h"]h$]h&]uh1j<hj]hhhhhNubj)}(h~In case you experience similar issues on your Dell machine, please submit a bugreport on bugzilla to we can apply workarounds.h]h~In case you experience similar issues on your Dell machine, please submit a bugreport on bugzilla to we can apply workarounds.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj]hhubeh}(h] firmware-bugsah ]h"] firmware bugsah$]h&]uh1j[hj]hhhhhMpubj\)}(hhh](ja)}(h Limitationsh]h Limitations}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1j`hj hhhhhMubj)}(hX6The SMM calls can take too long to execute on some machines, causing short hangs and/or audio glitches. Also the fan state needs to be restored after suspend, as well as the automatic mode settings. When reading a temperature sensor, values above 127 degrees indicate a BIOS read error or a deactivated sensor.h]hX6The SMM calls can take too long to execute on some machines, causing short hangs and/or audio glitches. Also the fan state needs to be restored after suspend, as well as the automatic mode settings. 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