Bug#926261: closed by Ben Hutchings <ben@decadent.org.uk> (Re: Bug#926261: linux-image-4.19.0-4-amd64: fan continiously spinning above 6900 RPM after resume on lenovo carbon x1 thinkpad with isa adapter)
Not going to argue against this being a firmware bug. I'm sure that is
true. But Linux must deal with buggy firmware. Else it cannot run on
any real system :-)
And this bug (or at least the bad effect on Linux) is a regression
introduced by commit c3a696b6e8f8 ("ACPI / EC: Use busy polling mode
when GPE is not enabled"), which again was an attempt to work around
firmware bugs in other systems.
This has been reported upstream, but AFAICS it is still only partially
fixed. Ref the thread ending here:
https://spinics.net/lists/stable/msg214463.html
Bjørn
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