Major update
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I've discovered that by switching to the open source Nouveau display
driver the problem disappears, even with the newest Ubuntu 5.13.0-20
kernel.
The problem was related to the "nvidia-driver-470" for my video card: GM107M
[GeForce GTX 950M].
The older 5.11.0-37
Interesting update. I've followed the build instructions for the Ubuntu
kernel: https://wiki.ubuntu.com/Kernel/BuildYourOwnKernel
By cloning the repo: git://kernel.ubuntu.com/ubuntu/ubuntu-impish
And building the kernel tagged as: Ubuntu-5.11.0-20.21+21.10.1
Which is *older* than the last _good_
** Tags added: kernel-bug kernel-therm
** Tags removed: kernel-bug
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https://bugs.launchpad.net/bugs/1947614
Title:
Laptop fans spin at ~50% w/o CPU load with kernel 5.13
To manage
To check the theory about the Ubuntu-specific patches, I tried to boot
another Linux distro (Fedora Live 35) in order to see if the problem
would exist: it did not.
The kernel used was: 5.14.10-300.fc35.x86_64.
Which is more recent that the kernel 5.13.0-20, currently used by Ubuntu
21.10.
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
