https://bugzilla.kernel.org/show_bug.cgi?id=213023
--- Comment #64 from Manuel Lauss (manuel.la...@gmail.com) ---
(In reply to Manuel Lauss from comment #63)
> This patch also disables CPPC support on a few of my relatively recent AMD
> Zen Desktop systems. The issue is that the ACPI _OSC method supports ONLY
> the UUID of the "PCI root bridge device", but not any other, but linux is
> looking for CPPC support with the "Platform-Wide OSPM Capabilities" uuid,
> which does not
> exist anywhere in the firmware. bios engineers told me that this is all
> part of AMDs AGESA thingie, and they won't be able to add support for this,
> at least
> on current (i.e. zen3-supporting) platforms.
>
> Could this be worked around, by first checking whether any _CPC objects
> exist, and maybe a matching PCC entry?
Oh I see this was fixed recently with
fbd74d16 ("ACPI: CPPC: Fix enabling CPPC on AMD systems with shared memory").
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