linux:powersave:fancontrol
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| linux:powersave:fancontrol [2021/04/26 17:30] – created oscar | linux:powersave:fancontrol [Unknown date] (current) – removed - external edit (Unknown date) 127.0.0.1 | ||
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| - | ====== Fan Control ====== | ||
| - | Fan PWM driver configuration path on Debian for Nuvotron 6775 is: **/ | ||
| - | < | ||
| - | pwm[1-*] Pulse width modulation fan control. | ||
| - | Integer value in the range 0 to 255 | ||
| - | RW | ||
| - | 255 is max or 100%. | ||
| - | pwm[1-*]_enable | ||
| - | Fan speed control method: | ||
| - | 0: no fan speed control (i.e. fan at full speed) | ||
| - | 1: manual fan speed control enabled (using pwm[1-*]) | ||
| - | 2+: automatic fan speed control enabled | ||
| - | Check individual chip documentation files for automatic mode | ||
| - | details. | ||
| - | RW | ||
| - | |||
| - | pwm[1-*]_mode 0: | ||
| - | 1: PWM mode (pulse-width modulation) | ||
| - | RW | ||
| - | |||
| - | pwm[1-*]_freq Base PWM frequency in Hz. | ||
| - | Only possibly available when pwmN_mode is PWM, but not always | ||
| - | present even then. | ||
| - | RW | ||
| - | |||
| - | pwm[1-*]_auto_channels_temp | ||
| - | Select which temperature channels affect this PWM output in | ||
| - | auto mode. Bitfield, 1 is temp1, 2 is temp2, 4 is temp3 etc... | ||
| - | Which values are possible depend on the chip used. | ||
| - | RW | ||
| - | |||
| - | pwm[1-*]_auto_point[1-*]_pwm | ||
| - | pwm[1-*]_auto_point[1-*]_temp | ||
| - | pwm[1-*]_auto_point[1-*]_temp_hyst | ||
| - | Define the PWM vs temperature curve. Number of trip points is | ||
| - | chip-dependent. Use this for chips which associate trip points | ||
| - | to PWM output channels. | ||
| - | RW | ||
| - | |||
| - | temp[1-*]_auto_point[1-*]_pwm | ||
| - | temp[1-*]_auto_point[1-*]_temp | ||
| - | temp[1-*]_auto_point[1-*]_temp_hyst | ||
| - | Define the PWM vs temperature curve. Number of trip points is | ||
| - | chip-dependent. Use this for chips which associate trip points | ||
| - | to temperature channels. | ||
| - | RW | ||
| - | </ | ||
| - | There is a third case where trip points are associated to both PWM output | ||
| - | channels and temperature channels: the PWM values are associated to PWM | ||
| - | output channels while the temperature values are associated to temperature | ||
| - | channels. In that case, the result is determined by the mapping between | ||
| - | temperature inputs and PWM outputs. When several temperature inputs are | ||
| - | mapped to a given PWM output, this leads to several candidate PWM values. | ||
| - | The actual result is up to the chip, but in general the highest candidate | ||
| - | value (fastest fan speed) wins. | ||
| - | |||
| - | |||
| - | ===== Links ===== | ||
| - | * [[https:// | ||
| - | * [[https:// | ||
linux/powersave/fancontrol.1619458248.txt.gz · Last modified: (external edit)