New: REGRESSION][amd_pstate] "EPP cannot be set under performance policy" (EBUSY) when switching to performance profile via PPD on 7.1
https://bugzilla.kernel.org/show_bug.cgi?id=221506
Bug ID: 221506
Summary: REGRESSION][amd_pstate] "EPP cannot be set under
performance policy" (EBUSY) when switching to performance profile via PPD on 7.1
Product: Power Management
Version: 2.5
Hardware: AMD
OS: Linux
Status: NEW
Severity: normal
Priority: P3
Component: cpufreq
Assignee: [email protected]
Reporter: [email protected]
Regression: No
Hardware: ASUS TUF Gaming A14 (2026) FA401EA
CPU: AMD Ryzen AI Max+ 932 (Strix Halo platform)
Kernel: 7.1.0-mainline (including patches for Bugzilla #221310) Power Daemon: power-profiles-daemon 0.30
Description:
On kernel 7.1, power-profiles-daemon fails to activate the "performance" profile. The D-Bus error returned is Code 26 (Device or resource busy).
After enabling dynamic debug for the amd_pstate module (echo 'module amd_pstate +p' > /sys/kernel/debug/dynamic_debug/control), I captured the following reason for the failure in dmesg:
[ 299.585428] amd_pstate: EPP cannot be set under performance policy
Steps to Reproduce:
Use a system with amd_pstate in active mode on kernel 7.1.
Attempt to switch profile: powerprofilesctl set performance.
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':
Device or resource busy (26)
The command fails, and dmesg logs: amd_pstate: EPP cannot be set under performance policy.
Expected Result:
The driver should allow setting the EPP value even if the policy is set to performance, or handle the transition gracefully without returning EBUSY to user-space daemons.
Additional Context:
This issue was observed on the new Strix Halo (Ryzen AI Max+) platform. The conflict between PPD's profile orchestration and the driver's internal state checks makes the "Performance" profile unusable via standard desktop tools (KDE/GNOME power settings).
I can build and test custom patches on this hardware
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[Bug 221506] REGRESSION][amd_pstate] "EPP cannot be set under performance policy" (EBUSY) when switching to performance profile via PPD on 7.1
https://bugzilla.kernel.org/show_bug.cgi?id=221506
Artem S. Tashkinov ([email protected]) changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |DUPLICATE--- Comment #1 from Artem S. Tashkinov ([email protected]) ---
*** This bug has been marked as a duplicate of bug 221505 ***
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