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I had some problems with fans in my laptop so I tried to diagnose it. When I run sensors command I get this:

... coretemp-isa-0000 Adapter: ISA adapter Package id 0: +58.0°C (high = +100.0°C, crit = +100.0°C) Core 0: +56.0°C (high = +100.0°C, crit = +100.0°C) Core 1: +57.0°C (high = +100.0°C, crit = +100.0°C) Core 2: +51.0°C (high = +100.0°C, crit = +100.0°C) Core 3: +53.0°C (high = +100.0°C, crit = +100.0°C) thinkpad-isa-0000 Adapter: ISA adapter fan1: 0 RPM CPU: -125.0°C GPU: +1.0°C temp3: +4.0°C temp4: +65.0°C temp5: +121.0°C temp6: +121.0°C temp7: +17.0°C temp8: +66.0°C ...

(I removed irrelevant info from output)

I am confused about the CPU: -125.0°C. I would be less surprised if the temperature was -127 but -125 seems so random to me.

Another thing is that my fans are clearly running (very loudly) and sensors output still says fan1: 0 rpm.

How can I fix my sensors to work correctly so my fans will not run all the time ?
Thank you for help

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lm-sensors supports a ton of monitoring chips however there are major caveats:

  • In many cases support is reverse engineered and extracted data may not mean anything or is extracted incorrectly
  • Some sensors may not be physically wired and could represent anything in the universe, including random data

lm-sensors allows to configure rules for your particular chip (thinkpad-isa-0000) using a configuration file in /etc/sensors.d/anyname.conf.

Arch Wiki has a nice overview of lm-sensors and how to configure everything: https://wiki.archlinux.org/title/lm_sensors

The project itself has a ton of contributed files which is worth looking into: https://github.com/lm-sensors/lm-sensors/tree/master/configs - if there's nothing for your laptop and you find out the proper rules to parse and show the data, please submit your config for others to use.

The standard configuration file (at least in Fedora) is in /etc/sensors3.conf. It's a good starting point.

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