Can't get AMD pstate to work. It used to be fine.

[c10l]

Title. I don't know when it stopped working but I suspect it was due to a kernel upgrade.

I have enabled CPPC on the BIOS. SR/IOV and IOMMU are also enabled and working.

This is am AM4 Ryzen on an ASRock X570M Pro4 mobo with the latest BIOS where they updated AGESA.

Any help would be greatly appreciated!

# uname -a
Linux pve0 6.17.2-2-pve #1 SMP PREEMPT_DYNAMIC PMX 6.17.2-2 (2025-11-26T12:33Z) x86_64 GNU/Linux

#  dmesg --level warn | grep amd
[    0.825638] amd_pstate: The CPPC feature is supported but currently disabled by the BIOS.
[    0.825889] amd_pstate: failed to set auto_sel, ret: -95
[    0.825890] amd_pstate: Failed to initialize CPU 0: -95
[    0.825915] amd_pstate: failed to set auto_sel, ret: -95
[    0.825916] amd_pstate: Failed to initialize CPU 1: -95
[    0.825950] amd_pstate: failed to set auto_sel, ret: -95
[    0.825951] amd_pstate: Failed to initialize CPU 2: -95
[    0.825984] amd_pstate: failed to set auto_sel, ret: -95
[    0.825986] amd_pstate: Failed to initialize CPU 3: -95
[    0.826021] amd_pstate: failed to set auto_sel, ret: -95
[    0.826023] amd_pstate: Failed to initialize CPU 4: -95
[    0.826059] amd_pstate: failed to set auto_sel, ret: -95
[    0.826060] amd_pstate: Failed to initialize CPU 5: -95
[    0.826098] amd_pstate: failed to set auto_sel, ret: -95
[    0.826099] amd_pstate: Failed to initialize CPU 6: -95
[    0.826136] amd_pstate: failed to set auto_sel, ret: -95
[    0.826138] amd_pstate: Failed to initialize CPU 7: -95
[    0.826169] amd_pstate: failed to set auto_sel, ret: -95
[    0.826171] amd_pstate: Failed to initialize CPU 8: -95
[    0.826206] amd_pstate: failed to set auto_sel, ret: -95
[    0.826207] amd_pstate: Failed to initialize CPU 9: -95
[    0.826241] amd_pstate: failed to set auto_sel, ret: -95
[    0.826243] amd_pstate: Failed to initialize CPU 10: -95
[    0.826280] amd_pstate: failed to set auto_sel, ret: -95
[    0.826281] amd_pstate: Failed to initialize CPU 11: -95
[    0.826322] amd_pstate: failed to set auto_sel, ret: -95
[    0.826323] amd_pstate: Failed to initialize CPU 12: -95
[    0.826363] amd_pstate: failed to set auto_sel, ret: -95
[    0.826364] amd_pstate: Failed to initialize CPU 13: -95
[    0.826404] amd_pstate: failed to set auto_sel, ret: -95
[    0.826406] amd_pstate: Failed to initialize CPU 14: -95
[    0.826441] amd_pstate: failed to set auto_sel, ret: -95
[    0.826443] amd_pstate: Failed to initialize CPU 15: -95

#  cpupower frequency-info
analyzing CPU 5:
  no or unknown cpufreq driver is active on this CPU
  CPUs which run at the same hardware frequency: Not Available
  CPUs which need to have their frequency coordinated by software: Not Available
  maximum transition latency:  Cannot determine or is not supported.
Not Available
  available cpufreq governors: Not Available
  Unable to determine current policy
  current CPU frequency: Unable to call hardware
  current CPU frequency:  Unable to call to kernel
  boost state support:
    Supported: yes
    Active: yes
    Boost States: 0
    Total States: 3
    Pstate-P0:  3600MHz
    Pstate-P1:  1700MHz
    Pstate-P2:  1400MHz

# dmesg | grep 'Kernel command line'
[    0.175642] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-6.17.2-2-pve root=UUID=9f037bcc-2200-4d4f-9495-72424219d87f ro amd_pstate=guided initcall_blacklist=acpi_cpufreq_init amd_pstate.shared_mem=1 acpi_backlight=vendor amd_iommu=on iommu=pt quiet