Amd_pstate failed to register with return 19?

General
1

this happend after bios update ? help !

2

can you provide

inxi -Mxxx
cpupower frequency-info
sudo journalctl -b0 | grep 'pstate'
3

Machine:
Type: Desktop Mobo: Gigabyte model: A520M S2H serial:
uuid: UEFI: American Megatrends LLC. v: F19g
date: 03/11/2025
analyzing CPU 4:
driver: acpi-cpufreq
CPUs which run at the same hardware frequency: 4
CPUs which need to have their frequency coordinated by software: 4
maximum transition latency: Cannot determine or is not supported.
hardware limits: 1.40 GHz - 3.80 GHz
available frequency steps: 3.80 GHz, 1.70 GHz, 1.40 GHz
available cpufreq governors: conservative ondemand userspace powersave performance schedutil
current policy: frequency should be within 1.40 GHz and 3.80 GHz.
The governor “schedutil” may decide which speed to use
within this range.
current CPU frequency: 3.61 GHz (asserted by call to kernel)
boost state support:
Supported: yes
Active: no

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apr 24 13:18:46 lachris kernel: amd_pstate: The CPPC feature is supported but currently disabled by the BIOS.
apr 24 13:18:46 lachris kernel: amd_pstate: failed to register with return -19

4

it is enable in bios ?

5

can you please recheck in your UEFI motherboard

  • mode CPPC is on

you should see amd-pstate-epp after reboot

6

Reset bios to defaults, can you do that? it is usually the shortest path when something doesn’t work.

7

get back to old version bios from 2024 . now it work again ? if i update bios cppc not vorking ? have try reset bios with no luck :slight_smile: stay on this bios version all working again :slight_smile:

8

cppc is that not for laptop ? is that not powerprofile settings

9

you should see this on cpu section

10

Just ran into this same situation on the same chipset but different board, an Asrock A520M-DHV, but the issue is the same. The latest BIOS from 2025 breaks AMD CPPC and results in both the errors the OP posted as well as no amd_pstate governing (higher core usage, more heat/power, etc.) Downgrading to the last BIOS from 2024 (version 3.52) fixes the issue.

11

Can you please provide the log? We can forward to to AMD.

12

okay did the same ting here .. an it works again , but tanks for all the help :slight_smile:

13

how do i make a log ? sorry :slight_smile:

14

in the wiki :slight_smile:

15

sudo cachyos-bugreport.sh