[Bug 219110] 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

--- Comment #2 from Artem S. Tashkinov (aros@gmx.com) ---
(In reply to xiaojian.du from comment #1)
> So you do one suspend cycle on your device?

I have to set/restore energy_performance_preference on every resume.

> I think CPU power status is reset after one suspend cycle.
> Yes, it should be a function to restore CPU power register status and
> governor status after s3/s4/s2idle.
> For you case, i think add one more shell script will fix this problem, you
> know, you are setting cpu enegy policy during booting, then your can add one
> same action during suspend, any chance for this?

I can certainly do that, but with acpi-cpufreq you didn't have to do that :-(

You set performance/powersave/ondemand and it perfectly survives
suspend/resume.

I wonder why amd-pstate cannot. A kernel module can keep this state as a simple
variable and restore the energy preference on resume.

And secondly it's quite misleading that it reports a wrong value after
resuming.

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

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