Kernel driver w83l786ng

Supported chips:

Author: Kevin Lo <>

Module Parameters

  • reset boolean

    (default 0)

    Use 'reset=1' to reset the chip (via index 0x40, bit 7). The default behavior is no chip reset to preserve BIOS settings


This driver implements support for Winbond W83L786NG/W83L786NR chips.

The driver implements two temperature sensors, two fan rotation speed sensors, and three voltage sensors.

Temperatures are measured in degrees Celsius and measurement resolution is 1 degC for temp1 and temp2.

Fan rotation speeds are reported in RPM (rotations per minute). Fan readings can be divided by a programmable divider (1, 2, 4, 8, 16, 32, 64 or 128 for fan 1/2) to give the readings more range or accuracy.

Voltage sensors (also known as IN sensors) report their values in millivolts. An alarm is triggered if the voltage has crossed a programmable minimum or maximum limit.

/sys files

  • this file stores PWM duty cycle or DC value (fan speed) in range:

    0 (stop) to 255 (full)

  • this file controls mode of fan/temperature control:

  • 0 Manual Mode

  • 1 Thermal Cruise

  • 2 Smart Fan II

  • 4 FAN_SET

  • Select PWM of DC mode

  • 0 DC

  • 1 PWM

  • Value in degrees of Celsius (degC) for +- T