Given that the problem exist with kernel 5.13.0-19 and newer but not
with kernel 5.11.0-37, I tried to find which the change triggered this
weird behavior using git bisect. I used bisect in the range [v5.11,
v5.13] (official tags) and I've built the standard non-ubuntu kernel(s)
using:
make -j4 bindeb-pkg LOCALVERSION=-custom
As config, I used the Ubuntu one from: /boot/config-5.11.0-37-generic
and accepted all the new config options as default.
But, before finishing to test all the bisect steps, I found that even
with the first kernel, v5.11, commit:
f40ddce88593482919761f74910f42f4b84c004b, the problem already exists.
Therefore, it looks like there were some Ubuntu-specific patches in
5.11.0-37 that prevented the problem to happen. In the original v5.11
kernel, the fans spin at ~50% apparently no matter the CPU load.
Apparently, those Ubuntu patches that prevented the problem from
happening, got changed in 5.13.0-19. Does anybody have a clue what could
that be?
Thanks,
Vlad
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https://bugs.launchpad.net/bugs/1947614
Title:
Laptop fans spin at ~50% w/o CPU load with kernel 5.13
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