[Bug 219110] New: amd-pstate's balance_performance energy_performance_preference doesn't survive suspend resume

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=219110

            Bug ID: 219110
           Summary: amd-pstate's balance_performance
                    energy_performance_preference doesn't survive suspend
                    resume
           Product: Power Management
           Version: 2.5
          Hardware: AMD
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: cpufreq
          Assignee: linux-pm@vger.kernel.org
          Reporter: aros@gmx.com
        Regression: No

On boot I'm setting
/sys/devices/system/cpu/cpufreq/*/energy_performance_preference to
`balance_performance` however after a suspend resume cycle it gets reset to
`performance` despite energy_performance_preference reporting that it's set to
`balance_performance` which is basically a lie.

How do I know it?

Start watching a 1440p/4K VP9/AV1 video with video acceleration on on YouTube.

With default performance I'm looking at more than 14W CPU package consumption
on average.

With balance_performance it goes down to roughly 8W.

Upon resume with reportedly balance_performance it's back to > 14W.

Please fix.

That's with kernel 6.9.12. If this has been fixed in 6.10, please let me know.

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