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

[bugzilla-daemon@kernel.org]

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

--- Comment #1 from badouri.g@gmail.com (badouri.g@gmail.com) ---
Hi there,

I'm running linux 6.5.11 on a  Asus ROG Zenith II Extreme (TRX40) with a AMD
Threadripper 3960X and the amd-pstate driver refuses to load due to missing
_CPC objects:

[    0.477523] amd_pstate: the _CPC object is not present in SBIOS or ACPI
disabled

However both CPPC and AMD Preferred core support is enabled in the firmware.
Also I can confirm there are _CPC entries in the ACPI tables.

acpidump > acpidump.out
acpixtract -a acpidump.out
iasl *.dat
grep -i cpc *.dsl

ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control
ssdt7.dsl:        Name (_CPC, Package (0x17)  // _CPC: Continuous Performance
Control

Any ideas why the driver cannot find them?
I could upload the dsl files somewhere if it helps.

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