Arch Linux

Salkay

Member

Registered: 2014-05-22

Posts: 619

[Bug found] fancontrol randomly stops working

I've set fancontrol up to reduce my fan speeds. This works perfectly most of the time, but occasionally my custom setting are not followed. Here are some screenshots from fancontrol_gui, at a temperature of 35°C. The fan should be at 40%, but the black dot shows it at 60% instead.

I restarted fancontrol.service, and now the curve was respected.

When this problem occured, the systemd service was running, and there was nothing obvious in journalctl. Here are the contents of /etc/fancontrol

INTERVAL=10
DEVPATH=hwmon1=devices/platform/nct6775.656 
DEVNAME=hwmon1=nct6793 
FCTEMPS=hwmon1/pwm2=hwmon1/temp7_input 
FCFANS=hwmon1/pwm2=hwmon1/fan2_input 
MINTEMP=hwmon1/pwm2=70 
MAXTEMP=hwmon1/pwm2=90 
MINSTART=hwmon1/pwm2=255 
MINSTOP=hwmon1/pwm2=102 
MINPWM=hwmon1/pwm2=102 
MAXPWM=hwmon1/pwm2=255 
AVERAGE=hwmon1/pwm2=1 

I can provide more information on my setup, but it seems odd that there is inconsistent behaviour here.

EDIT: it only happens after suspend–wake cycles. This is the relevant bug. I've edited the wiki to mention this.

Last edited by Salkay (2020-08-16 10:35:36)