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Thanks alot @BipBip1981 Changing the values at FCTEMPS from `/dev/thermal-cpu/temp1_input` to `/sys/class/thermal/thermal_zone0/temp` fixed it. My dumb ass then updated the system via OVM and after a reboot the fan started spinning non-stop again, this time: root@helios64:~# systemctl status fancontrol.service ● fancontrol.service - fan speed regulator Loaded: loaded (/lib/systemd/system/fancontrol.service; enabled; vendor preset: enabled) Active: failed (Result: exit-code) since Sun 2024-10-06 10:49:39 UTC; 6s ago Docs: man:fancontrol(8) man:pwmconfig(8) Process: 1653 ExecStartPre=/usr/sbin/fancontrol --check (code=exited, status=0/SUCCESS) Process: 1773 ExecStart=/usr/sbin/fancontrol (code=exited, status=1/FAILURE) Main PID: 1773 (code=exited, status=1/FAILURE) Oct 06 10:49:39 helios64 fancontrol[1773]: MINSTOP=40 Oct 06 10:49:39 helios64 fancontrol[1773]: MINPWM=0 Oct 06 10:49:39 helios64 fancontrol[1773]: MAXPWM=255 Oct 06 10:49:39 helios64 fancontrol[1773]: Error: file /dev/fan-p6/pwm1 doesn't exist Oct 06 10:49:39 helios64 fancontrol[1773]: Error: file /dev/fan-p7/pwm1 doesn't exist I somehow pieced the new value together via: https://community.clearlinux.org/t/fancontrol-and-pwmconfig-hwmon3-pwm1-and-hwmon3-fan1-input-not-found/7516/5 https://bbs.archlinux.org/viewtopic.php?id=243169 https://www.reddit.com/r/linuxquestions/comments/n7lwga/fancontrol_error_file_doesnt_exist_or_isnt/ Fan is silent now and fancontrol.service is active (running) with: root@helios64:~# cat fancontrol/fancontrol INTERVAL=10 FCTEMPS=/sys/devices/platform/p6-fan/hwmon/hwmon5/pwm1=/sys/class/thermal/thermal_zone0/temp /sys/devices/platform/p7-fan/hwmon/hwmon4/pwm1=/sys/class/thermal/thermal_zone1/temp MINTEMP=/sys/devices/platform/p6-fan/hwmon/hwmon5/pwm1=40 /sys/devices/platform/p7-fan/hwmon/hwmon4/pwm1=40 MAXTEMP=/sys/devices/platform/p6-fan/hwmon/hwmon5/pwm1=110 /sys/devices/platform/p7-fan/hwmon/hwmon4/pwm1=110 MINSTART=/sys/devices/platform/p6-fan/hwmon/hwmon5/pwm1=60 /sys/devices/platform/p7-fan/hwmon/hwmon4/pwm1=60 MINSTOP=/sys/devices/platform/p6-fan/hwmon/hwmon5/pwm1=40 /sys/devices/platform/p7-fan/hwmon/hwmon4/pwm1=40 MINPWM=20 This is working on: root@helios64:~# lsb_release -a No LSB modules are available. Distributor ID: Debian Description: Debian GNU/Linux 10 (buster) Release: 10 Codename: buster root@helios64:~# uname -r 6.6.47-current-rockchip64