[REGRESSION] Too-low frequency limit for AMD GPU PCI-passed-through to Windows VM

[Thorsten Leemhuis]

On 13.03.22 19:33, James Turner wrote:
>
>> My understanding at this point is that the root problem is probably
>> not in the Linux kernel but rather something else (e.g. the machine
>> firmware or AMD Windows driver) and that the change in f9b7f3703ff9
>> ("drm/amdgpu/acpi: make ATPX/ATCS structures global (v2)") simply
>> exposed the underlying problem.

FWIW: that in the end is irrelevant when it comes to the Linux kernel's
'no regressions' rule. For details see:

https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/Documentation/admin-guide/reporting-regressions.rst
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/Documentation/process/handling-regressions.rst

That being said: sometimes for the greater good it's better to not
insist on that. And I guess that might be the case here.

> I'm not sure where to go from here. This issue isn't much of a concern> for me anymore, since blacklisting `amdgpu` works for my machine. At>
this point, my understanding is that the root problem needs to be fixed>
in AMD's Windows GPU driver or Dell's firmware, not the Linux kernel.
If> any of the AMD developers on this thread would like to forward it to
the> AMD Windows driver team, I'd be happy to work with AMD to fix the
issue> properly.
In that case I'll drop it from the list of regressions, unless what I
wrote above makes you change your mind.

#regzbot invalid: firmware issue exposed by kernel change, user seems to
be happy with a workaround

Thx everyone who participated in handling this.

Ciao, Thorsten