[Bug 218171] amd-pstate not loading on zen2 threadripper 3960x (trx40

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=218171

Mithat (ozin@itu.edu.tr) changed:

           What    |Removed                     |Added
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                 CC|                            |ozin@itu.edu.tr

--- Comment #19 from Mithat (ozin@itu.edu.tr) ---
Hello Everyone,

I dunno if its relevant but my observations regarding the problem are:

As far as I understand, AMD CPUs declares CPPC via CPUID intruction.

1) cpuid 0x80000008 (ebx) CPPC bit is always 0 (disabled) whether you enable or
disable CPPC in BIOS.

2) Asus AMI Bios does not have _OSC declaration for CPPC support in DSDT and
SSDT tables.

3) There exists _CPC declarations in a SSDT table but since CPPC support is not
declared, it is omitted by Linux kernel ?

Hence, amd_pstate module declares "the _CPC object is not present in SBIOS or
ACPI disabled" ?

Hope it helps.

Mithat

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