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I'm running Ubuntu 20.04 on an older Dell laptop, and recently, I noticed that it has been getting very hot. I tried running sudo pwmconfig, the output of which was;

Found the following fan sensors:
hwmon5/fan1_input     current speed: 0 ... skipping!

There are no working fan sensors, all readings are 0.
Make sure you have a 3-wire fan connected.
You may also need to increase the fan divisors.

I am not sure if the fan works, nor how to start it and that is what I need to know.

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I do not know how to start the fans - I even doubt that this is possible - but I know how you can query them:

Install the ipmi tools:

sudo apt-get install freeipmi

Then query all sensors:

sudo ipmi-sensors | grep FAN

which will give me on my system the installed fans with the rpm.

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  • I tried it, it returned: ipmi_sdr_cache_create: internal IPMI error
    – puma
    Aug 16, 2021 at 18:49
  • Sorry - here I can't help ...
    – thomas
    Aug 16, 2021 at 19:52
  • For consumer grade PCs there is no IPMI, that's a feature for servers.
    – thomas
    Mar 19 at 12:50

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