[ltp] the fan of ThinkPad X1 Carbon 4th starts quite often lately

[Diego Borghetti]

Hello,

Fan running because of temperature is not always something bad.
What you need to check is if it's running at the right time.

I have a T470 here and I was having a problem with the fan running
as soon my temperature hit 60C, which is wrong. The main problem
was not the fan. I notice the fan because my CPU was getting throttling
by the kernel, which result  in very poor performance.

After researching a little I found this post here:

https://www.reddit.com/r/thinkpad/comments/870u0a/t480s_linux_throttling_bug/

Also here:

https://forums.lenovo.com/t5/Other-Linux-Discussions/X1C6-T480s-low-cTDP-and-trip-temperature-in-Linux/td-p/4028489

Not sure if you are having the same problem, but just give it a read
and then do some research in the laptop.

In my case, the problem was the TCC activation offset.

The best way to test is to run something CPU intensive and use
something like s-tui to monitor what is going on with the laptop.

You can check s-tui at: https://github.com/amanusk/s-tui
It show you pretty much everything: MHz, Temp, Watts, Fan RPM.

Another good idea is to look at the output of dmesg to check
for any error from the kernel.

Hope that help!
Cheers,
Diego

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Saturday, April 11, 2020 4:24 PM, Uwe Brauer <oub.oub.oub at gmail.com> wrote:

>
>
> Hi
>
> I am running Ubuntu 16.04 on my Thinkpad X1, but lately I noted that the
> fan starts because the temperature rises.
>
> I run then either ps aux or
> sudo /usr/local/bin/ps_mem
>
> But have difficulties to find the culprit.
>
> Does somebody have an idea, how to track this down.
>
> Thanks and regards
>
> Uwe Brauer
>
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