[Bug 218686] Fail to set energy_performance_preference of amd processor on asus ga403uv

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=218686

--- Comment #74 from xiaojian.du@amd.com ---
I checked on my desktop PC, based on Asus B650M mainboard.

"Advanced option-> CPU option -> PSS disable/enable"is the switch option of
CPPC.
Disabling *PSS* option will make Win11 OS switch to generic ACPI processor pm
management.

Back to this issue, somehow ASUS has enabled CPPC support in bios,as it showes
"PSS ENABLED" in this video. 
 https://bugzilla.kernel.org/attachment.cgi?id=306662

But the key CPUID bit of CPPC func enablement still is not written "1" in this
new version BIOS, besides, the dmesg log shows the _cpc obj  in the ACPI table
is null,
"ACPI CPPC: _CPC in PCC is not supported".

So the conclusion is, CPPC func is enabled in this new version BIOS and Win OS
is using it, but it doesn't support Linux OS.

Maybe ASUS didn't put too much notice to the user case on linux os?

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