Well, that's essentially it. When I choose acpi for fan control in config file, thinkfan won't start and throws that error. First encountered that problem after I switched from Kubuntu to Manjaro.
[user@t430 ~]$ systemctl status thinkfan.service
× thinkfan.service - Thinkfan, the minimalist fan control program
Loaded: loaded (/usr/local/lib/systemd/system/thinkfan.service; enabled; vendor preset: disabled)
Drop-In: /etc/systemd/system/thinkfan.service.d
└─override.conf
Active: failed (Result: exit-code) since Thu 2021-07-01 17:20:41 CEST; 5s ago
Process: 6438 ExecStart=/usr/local/sbin/thinkfan $THINKFAN_ARGS (code=exited, status=1/FAILURE)
CPU: 5ms
Jul 01 17:20:41 t430 systemd[1]: Starting Thinkfan, the minimalist fan control program...
Jul 01 17:20:41 t430 thinkfan[6438]: ERROR: /proc/acpi/ibm/fan: Unknown file format.
Jul 01 17:20:41 t430 systemd[1]: thinkfan.service: Control process exited, code=exited, status=1/FAILURE
Jul 01 17:20:41 t430 systemd[1]: thinkfan.service: Failed with result 'exit-code'.
Jul 01 17:20:41 t430 systemd[1]: Failed to start Thinkfan, the minimalist fan control program.
Well, that's essentially it. When I choose acpi for fan control in config file, thinkfan won't start and throws that error. First encountered that problem after I switched from Kubuntu to Manjaro.
My config
The fan file