https://wiki.archlinux.org/index.php/Fan_speed_control

fancontrolis a part oflm_sensors, which can be used to control the speed of CPU/case fans.

Support for newer motherboards may not yet be in the Linux kernel. Check the officiallm-sensors devicestable to see if experimental drivers are available for such motherboards.

It is recommended not to uselm_sensors.serviceto load the needed modules for fancontrol. Instead, manually place them in/etc/modules-load.d/load_these.confsince the order in which these modules are loaded dictate the order in which the needed symlinks for hwmon get created. In other words, using thelm_sensors.servicecauses inconsistencies boot-to-boot which will render the configuration file for fan control worthless for a consistency point of view. To avoid this problem:

In/etc/conf.d/lm_sensorsyou find the modules. If not there, run as rootsensors-detectaccepting the defaults. In themodules-load.dfile place one module name per line. Specifying them like this will create a reproducible order. Another alternative is to use absolute device names in the configuration file.[1]

lm-sensors

Set uplm_sensors.

$ sensors

coretemp-isa-0000
Adapter: ISA adapter
Core 0:      +29.0°C  (high = +76.0°C, crit = +100.0°C)  

[...]

it8718-isa-0290
Adapter: ISA adapter
Vcc:         +1.14 V  (min =  +0.00 V, max =  +4.08 V)   
VTT:         +2.08 V  (min =  +0.00 V, max =  +4.08 V)   
+3.3V:       +3.33 V  (min =  +0.00 V, max =  +4.08 V)   
NB Vcore:    +0.03 V  (min =  +0.00 V, max =  +4.08 V)   
VDRAM:       +2.13 V  (min =  +0.00 V, max =  +4.08 V)   
fan1:        690 RPM  (min =   10 RPM)
temp1:       +37.5°C  (low  = +129.5°C, high = +129.5°C)  sensor = thermistor
temp2:       +25.0°C  (low  = +127.0°C, high = +127.0°C)  sensor = thermal diode

If the output does not display an RPM value for the CPU fan, one may need to increase the fan divisor. If fan speed is shown and higher than 0, skip the next step.

Increasing fan_div

The first line of the sensors output is the chipset used by the motherboard for readings of temperatures and voltages.

Create a file in/etc/sensors.d/:

/etc/sensors.d/fan-speed-control.conf

chip "coretemp-isa-*"
set fanX_div 4

Replacingcoretemp-isa-with name of the chipset andXwith the number of the CPU fan to change.

Save the file, and run as root:

# sensors -s

which will reload the configuration files.

Runsensorsagain, and check if there is an RPM readout. If not, increase the divisor to 8, 16, or 32. YMMV!

Configuration

Note:Advanced users may want to skip this section and write/etc/fancontrolon their own, which also saves them from hearing all of the fans at full speed.

Once sensors are properly configured, usepwmconfigto test and configure fan speed control. The default configuration options should create/etc/fancontrolconfiguration file:

# pwmconfig

Tweaking

Note:On several systems, the included script may report errors as it tries to calibrate fans to the respective pulse-width modulation (PWM). Users may safely ignore these errors. The problem is that the script does not wait long enough before ramping up or down the PWM.

Users wishing more control may need to tweak the generated configuration. Here is a sample configuration file:

INTERVAL=10
DEVPATH=hwmon0=devices/platform/coretemp.0 hwmon2=devices/platform/w83627ehf.656
DEVNAME=hwmon0=coretemp hwmon2=w83627dhg
FCTEMPS=hwmon0/device/pwm1=hwmon0/device/temp1_input
FCFANS= hwmon0/device/pwm1=hwmon0/device/fan1_input
MINTEMP=hwmon0/device/pwm1=20
MAXTEMP=hwmon0/device/pwm1=55
MINSTART=hwmon0/device/pwm1=150
MINSTOP=hwmon0/device/pwm1=105

INTERVAL: how often the daemon should poll CPU temps and adjust fan speeds. INTERVAL is in seconds.

The rest of the configuration file is split into (at least) two values per configuration option. Each configuration option first points to a PWM device which is written to which sets the fan speed. The second "field" is the actual value to set. This allows monitoring and controlling multiple fans and temperatures.

FCTEMPS: The temperature input device to read for CPU temperature. The above example corresponds to/sys/class/hwmon/hwmon0/device/temp1_input.
FCFANS: The current fan speed, which can be read (like the temperature) in/sys/class/hwmon/hwmon0/device/fan1_input
MINTEMP: The temperature (°C) at which toSHUT OFFthe CPU fan. Efficient CPUs often will not need a fan while idling. Be sure to set this to a temperature thatyou know is safe. Setting this to 0 is not recommended and may ruin your hardware!
MAXTEMP: The temperature (°C) at which to spin the fan at itsMAXIMUMspeed. This should be probably be set to perhaps 10 or 20 degrees (°C) below your CPU's critical/shutdown temperature. Setting it closer to MINTEMP will result in higher fan speeds overall.
MINSTOP: The PWM value at which your fan stops spinning. Each fan is a little different. Power tweakers canechodifferent values (between 0 and 255) to/sys/class/hwmon/hwmon0/device/pwm1and then watch the CPU fan. When the CPU fan stops, use this value.
MINSTART: The PWM value at which your fan starts to spin again. This is often a higher value than MINSTOP as more voltage is required to overcome inertia.

There are also two settings fancontrol needs to verify the configuration file is still up to date. The lines start with the setting name and an equality sign, followed by groups of hwmon-class-device=setting, separated by spaces. You need to specify each setting for each hwmon class device you use anywhere in the config, or fancontrol will not work.

DEVPATH: Sets the physical device. You can determine this by executing the command

readlink -f /sys/class/hwmon/[your-hwmon-device]/device | sed -e 's/^/sys///'

DEVNAME: Sets the name of the device. Try:

$ sed -e 's/[[:space:]=]/_/g' /sys/class/hwmon/[your-hwmon-device]/device/name

Tip:UseMAXPWMandMINPWMoptions that limit fan speed range. See fancontrol manual page for details.
Tip:Not only theDEVPATHmay change on reboot due to different timing of module loading, but also e.g. the temperature sensor paths (hwmon0/device/temp1_input becomes hwmon0/temp1_input). This usually happens on a kernel update. Check the system log to find out which is the troublemaker:

# systemctl status fancontrol.service

and correct your config file accordingly.

fancontrol

Note:Upon upgrading/changing the kernel, runningfancontrolmay result in an error regarding changed device paths. This issue may be fixed by runningsensors-detectagain and restarting the system.

Try to runfancontrol:

# /usr/bin/fancontrol

A properly configured setup will not error out and will take control of system fans. Users should hear system fans slowing shortly after executing this command.

To enable startingfancontrolautomatically on every boot,enablefancontrol.service.

For an unofficial GUIinstallfancontrol-gui^AURorfancontrol-kcm^AUR.

NBFC

NBFC is a cross-platform fan control solution for notebooks. It comes with a powerful configuration system, which allows to adjust it to many different notebook models, including some of the latest ones.

Installation

NBFC can be installed asnbfc^AURornbfc-git^AUR. Also start and enablenbfc.service.

Configuration

NBFC comes with pre-made profiles. You can find them in/opt/nbfc/Configs/directory. When applying them, use exact profile name without extension (e.g.some profile.xmlbecomes"some profile").

Check if there is anything NBFC can recommend:

$ nbfc config -r

If there is at least one model, try to apply this profile and see how fan speeds are being handled. For example:

$ nbfc config -a "Asus Zenbook UX430UA"

Note:If you are gettingFile Descriptor does not support writing, deleteStagWare.Plugins.ECSysLinux.dll[2]andrestartnbfc.service:

# mv /opt/nbfc/Plugins/StagWare.Plugins.ECSysLinux.dll /opt/nbfc/Plugins/StagWare.Plugins.ECSysLinux.dll.old

If above solution did not help, try appendingec_sys.write_support=1tokernel parameters.

If there are no recommended models, go toNBFC git repositoryor/opt/nbfc/Configs/and check if there are any similar models available from the same manufacturer. For example, onAsus Zenbook UX430UQ, the configurationAsus Zenbook UX430UAdid not work well (fans completelly stopped all the time), butAsus Zenbook UX410UQworked fantastically.

Runnbfcto see all options. More information about configuration is available atupstream wiki.

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