€•%      Œsphinx.addnodes”Œdocument”“”)”}”(Œ	rawsource”Œ ”Œchildren”]”(Œtranslations”ŒLanguagesNode”“”)”}”(hhh]”(h Œpending_xref”“”)”}”(hhh]”Œdocutils.nodes”ŒText”“”ŒChinese (Simplified)”…””}”Œparent”hsbaŒ
attributes”}”(Œids”]”Œclasses”]”Œnames”]”Œdupnames”]”Œbackrefs”]”Œ	refdomain”Œstd”Œreftype”Œdoc”Œ	reftarget”Œ+/translations/zh_CN/sound/designs/powersave”Œmodname”NŒ	classname”NŒrefexplicit”ˆuŒtagname”hhhubh)”}”(hhh]”hŒChinese (Traditional)”…””}”hh2sbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ+/translations/zh_TW/sound/designs/powersave”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒItalian”…””}”hhFsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ+/translations/it_IT/sound/designs/powersave”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒJapanese”…””}”hhZsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ+/translations/ja_JP/sound/designs/powersave”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒKorean”…””}”hhnsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ+/translations/ko_KR/sound/designs/powersave”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒSpanish”…””}”hh‚sbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ+/translations/sp_SP/sound/designs/powersave”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubeh}”(h]”h ]”h"]”h$]”h&]”Œcurrent_language”ŒEnglish”uh1h
hhŒ	_document”hŒsource”NŒline”NubhŒsection”“”)”}”(hhh]”(hŒtitle”“”)”}”(hŒNotes on Power-Saving Mode”h]”hŒNotes on Power-Saving Mode”…””}”(hh¨hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hh£hžhhŸŒE/var/lib/git/docbuild/linux/Documentation/sound/designs/powersave.rst”h KubhŒ	paragraph”“”)”}”(hŒ»AC97 and HD-audio drivers have the automatic power-saving mode.
This feature is enabled via Kconfig ``CONFIG_SND_AC97_POWER_SAVE``
and ``CONFIG_SND_HDA_POWER_SAVE`` options, respectively.”h]”(hŒdAC97 and HD-audio drivers have the automatic power-saving mode.
This feature is enabled via Kconfig ”…””}”(hh¹hžhhŸNh NubhŒliteral”“”)”}”(hŒ``CONFIG_SND_AC97_POWER_SAVE``”h]”hŒCONFIG_SND_AC97_POWER_SAVE”…””}”(hhÃhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÁhh¹ubhŒ
and ”…””}”(hh¹hžhhŸNh NubhÂ)”}”(hŒ``CONFIG_SND_HDA_POWER_SAVE``”h]”hŒCONFIG_SND_HDA_POWER_SAVE”…””}”(hhÕhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÁhh¹ubhŒ options, respectively.”…””}”(hh¹hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Khh£hžhubh¸)”}”(hX?  With the automatic power-saving, the driver turns off the codec power
appropriately when no operation is required.  When no applications use
the device and/or no analog loopback is set, the power disablement is
done fully or partially.  It'll save a certain power consumption, thus
good for laptops (even for desktops).”h]”hXA  With the automatic power-saving, the driver turns off the codec power
appropriately when no operation is required.  When no applications use
the device and/or no analog loopback is set, the power disablement is
done fully or partially.  Itâ€™ll save a certain power consumption, thus
good for laptops (even for desktops).”…””}”(hhíhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K	hh£hžhubh¸)”}”(hX  The time-out for automatic power-off can be specified via ``power_save``
module option of snd-ac97-codec and snd-hda-intel modules.  Specify
the time-out value in seconds.  0 means to disable the automatic
power-saving.  The default value of timeout is given via
``CONFIG_SND_AC97_POWER_SAVE_DEFAULT`` and
``CONFIG_SND_HDA_POWER_SAVE_DEFAULT`` Kconfig options.  Setting this to 1
(the minimum value) isn't recommended because many applications try to
reopen the device frequently.  10 would be a good choice for normal
operations.”h]”(hŒ:The time-out for automatic power-off can be specified via ”…””}”(hhûhžhhŸNh NubhÂ)”}”(hŒ``power_save``”h]”hŒ
power_save”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÁhhûubhŒ¿
module option of snd-ac97-codec and snd-hda-intel modules.  Specify
the time-out value in seconds.  0 means to disable the automatic
power-saving.  The default value of timeout is given via
”…””}”(hhûhžhhŸNh NubhÂ)”}”(hŒ&``CONFIG_SND_AC97_POWER_SAVE_DEFAULT``”h]”hŒ"CONFIG_SND_AC97_POWER_SAVE_DEFAULT”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÁhhûubhŒ and
”…””}”(hhûhžhhŸNh NubhÂ)”}”(hŒ%``CONFIG_SND_HDA_POWER_SAVE_DEFAULT``”h]”hŒ!CONFIG_SND_HDA_POWER_SAVE_DEFAULT”…””}”(hj'  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÁhhûubhŒ½ Kconfig options.  Setting this to 1
(the minimum value) isnâ€™t recommended because many applications try to
reopen the device frequently.  10 would be a good choice for normal
operations.”…””}”(hhûhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Khh£hžhubh¸)”}”(hX	  The ``power_save`` option is exported as writable.  This means you can
adjust the value via sysfs on the fly.  For example, to turn on the
automatic power-save mode with 10 seconds, write to
``/sys/module/snd_ac97_codec/parameters/power_save`` (usually as root):
::”h]”(hŒThe ”…””}”(hj?  hžhhŸNh NubhÂ)”}”(hŒ``power_save``”h]”hŒ
power_save”…””}”(hjG  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÁhj?  ubhŒ­ option is exported as writable.  This means you can
adjust the value via sysfs on the fly.  For example, to turn on the
automatic power-save mode with 10 seconds, write to
”…””}”(hj?  hžhhŸNh NubhÂ)”}”(hŒ4``/sys/module/snd_ac97_codec/parameters/power_save``”h]”hŒ0/sys/module/snd_ac97_codec/parameters/power_save”…””}”(hjY  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÁhj?  ubhŒ (usually as root):”…””}”(hj?  hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Khh£hžhubhŒliteral_block”“”)”}”(hŒ<# echo 10 > /sys/module/snd_ac97_codec/parameters/power_save”h]”hŒ<# echo 10 > /sys/module/snd_ac97_codec/parameters/power_save”…””}”hjs  sbah}”(h]”h ]”h"]”h$]”h&]”Œ	xml:space”Œpreserve”uh1jq  hŸh¶h Khh£hžhubh¸)”}”(hŒþNote that you might hear click noise/pop when changing the power
state.  Also, it often takes certain time to wake up from the
power-down to the active state.  These are often hard to fix, so
don't report extra bug reports unless you have a fix patch ;-)”h]”hX   Note that you might hear click noise/pop when changing the power
state.  Also, it often takes certain time to wake up from the
power-down to the active state.  These are often hard to fix, so
donâ€™t report extra bug reports unless you have a fix patch ;-)”…””}”(hjƒ  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K"hh£hžhubh¸)”}”(hXC  For HD-audio interface, there is another module option,
power_save_controller.  This enables/disables the power-save mode of
the controller side.  Setting this on may reduce a bit more power
consumption, but might result in longer wake-up time and click noise.
Try to turn it off when you experience such a thing too often.”h]”hXC  For HD-audio interface, there is another module option,
power_save_controller.  This enables/disables the power-save mode of
the controller side.  Setting this on may reduce a bit more power
consumption, but might result in longer wake-up time and click noise.
Try to turn it off when you experience such a thing too often.”…””}”(hj‘  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K'hh£hžhubeh}”(h]”Œnotes-on-power-saving-mode”ah ]”h"]”Œnotes on power-saving mode”ah$]”h&]”uh1h¡hhhžhhŸh¶h Kubeh}”(h]”h ]”h"]”h$]”h&]”Œsource”h¶uh1hŒcurrent_source”NŒcurrent_line”NŒsettings”Œdocutils.frontend”ŒValues”“”)”}”(h¦NŒ	generator”NŒ	datestamp”NŒsource_link”NŒ
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