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

Uwe Brauer oub.oub.oub at gmail.com
Wed Apr 15 22:11:17 CEST 2020

>>> "DB" == Diego Borghetti <bdiego at pm.me> writes:

   > 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.

That is interesting, sensors tells me 56 C, fan is up, and 
top tells me that chrome and seamonkey eat up 70% CPU which does not
make much sense.

Kill seamonkey made the fan stop.

   > 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.

Thanks for all this valueable information. I will try!

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