P-State warning

[GaVenga]

Since update to kernel 6.6.5-1 this Warning in jounalctl:

archlinux kernel: amd_pstate: the _CPC object is not present in SBIOS or ACPI disabled

CPU: AMD Ryzen 3 1300X Quad-Core Processor
Board: ASUSTeK COMPUTER INC. PRIME B350-PLUS

Machine / CPU does not support amd-p-state (afaik) lscpu | grep "cppc" ==> output = nothing

EDIT: no warning using kernel 6.1.66-1

[zbe]

@GaVenga

6.6.66-1

[Nachlese]

I found this in the colored note under section 2 (scaling drivers) on the Arch wiki:

CPU frequency scaling - ArchWiki

The amd_pstate CPU power scaling driver is not active by default, but can be manually enabled when using a supported CPU (Zen 2 and newer) by adding amd_pstate=passive, amd_pstate=active or amd_pstate=guided as a kernel parameter. Some motherboards might not enable the required setting in their firmware, leading to a the _CPC object is not present in SBIOS or ACPI disabled error. Change Enable CPPC , usually found in the AMD CBS > NBIO > SMU > CPPC, from Auto to Enabled, or any similar settings in your UEFI. If they are not present, consult the vendor website for an update.

Perhaps it’s useful.

[stephane]

can your report version UEFI motherboard ?

[soundofthunder]

@stephane

can your report version UEFI motherboard ?

PRIME B350-PLUS … as the OP clearly stated.

It’s an Asus branded board; Asia-Pacific region.

[Johanides]

Ryzen 1300x is zen first gen so its not supported by amd_pstate driver.
With kernel 6.1 it probably just uses the default acpi driver.

[GaVenga]

@Johanides

its not supported by amd_pstate driver

That is exactly what I wanted to know, thank You!!!
Confirmed this CPU uses the default acpi-driver on all kernels.
So the warning is to ignore safely…