[Bug 221505] REGRESSION][amd_pstate] "EPP cannot be set under performance policy" (EBUSY) when switching to performance profile via PPD on 7.1

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=221505

--- Comment #13 from Alex Ungur (alexaandru@gmail.com) ---
I use 7.1-rc5 and I can switch just fine to balanced or power-saver but not to
performance:

```
$ powerprofilesctl
  performance:
    CpuDriver:  amd_pstate
    PlatformDriver:     platform_profile
    Degraded:   no

* balanced:
    CpuDriver:  amd_pstate
    PlatformDriver:     platform_profile

  power-saver:
    CpuDriver:  amd_pstate
    PlatformDriver:     platform_profile
$ powerprofilesctl set power-saver # ok
$ powerprofilesctl set balanced    # ok
$ powerprofilesctl set performance # not ok
Failed to communicate with power-profiles-daemon: g-io-error-quark:
GDBus.Error:org.gtk.GDBus.UnmappedGError.Quark._g_2dio_2derror_2dquark.Code26:
Failed to activate CPU driver 'amd_pstate': Error writing
'/sys/devices/system/cpu/cpufreq/policy11/energy_performance_preference':
Resource busy (26)
```

It worked fine with rc4 though... I could switch to any profile, incl.
performance.

My machine is:
```
$ inxi -CM
Machine:
  Type: Laptop System: ASUSTeK product: ASUS Vivobook S 16 M5606WA_M5606WA
    v: 1.0 serial: <superuser required>
  Mobo: ASUSTeK model: M5606WA v: 1.0 serial: <superuser required>
    UEFI: American Megatrends LLC. v: M5606WA.316 date: 01/05/2026
CPU:
  Info: 12-core model: AMD Ryzen AI 9 HX 370 w/ Radeon 890M bits: 64
    type: MT MCP cache: L2: 12 MiB
  Speed (MHz): avg: 3585 min/max: 605/5158:3289 cores: 1: 3585 2: 3585
    3: 3585 4: 3585 5: 3585 6: 3585 7: 3585 8: 3585 9: 3585 10: 3585 11: 3585
    12: 3585 13: 3585 14: 3585 15: 3585 16: 3585 17: 3585 18: 3585 19: 3585
    20: 3585 21: 3585 22: 3585 23: 3585 24: 3585
```

-- 
You may reply to this email to add a comment.

You are receiving this mail because:
You are the assignee for the bug.