Linux CPU Temperature and Fan Control#
Control speed of fans based on temperature readings.
sudo apt-get install -y lm-sensors fancontrol
Temperature Readings with sensors#
sensors
For us, CPU temperature is present, but bridge is missing. Looks like we need additional kernel modules.
Show modules to load:
sensors-detect
Configure them for systemd
cat <<'EOF' > /etc/modules-load.d/lm-sensors.conf
# from running `sensors-detect`
coretemp
nct6775
EOF
systemctl status systemd-modules-load.service
systemctl restart systemd-modules-load.service
systemctl status systemd-modules-load.service
Both CPU and bridge temperatures are present.
sensors
Her is our output of sensors -u.
fancontrol#
open case to check fans visually
run
pwmconfigto generate/etc/fancontrolstart fancontrol daemon
close case
Stop fancontrol and run pwmconfig
systemctl stop fancontrol.service
pwmconfig
Check the fans found:
Found the following fan sensors:
hwmon1/fan1_input current speed: 0 ... skipping!
hwmon1/fan2_input current speed: 2054 RPM
hwmon1/fan3_input current speed: 0 ... skipping!
hwmon1/fan4_input current speed: 1238 RPM
hwmon1/fan5_input current speed: 1247 RPM
Walk through the rest of the wizard and write /etc/fancontrol.
Enable fancontrol
systemctl enable --now fancontrol
Note to Self#
140mm (side):
It appears that fan hwmon1/fan5_input
is controlled by pwm hwmon1/pwm3
120mm (back):
It appears that fan hwmon1/fan2_input
is controlled by pwm hwmon1/pwm2
Stress and Tune#
apt install stress-ng
stress-ng --cpu 8
watch sensors
Further Reading#
https://askubuntu.com/questions/22108/how-to-control-fan-speed is based on Ubuntu 12.
https://calbryant.uk/blog/better-pc-cooling-with-python/ Shows reading temperatures and writing fan speeds with Python, using a control loop and writing monitoring data to InfluxDB to later visualize in Grafana.