[Bug 219332] /sys/devices/system/cpu/cpufreq/policy0/energy_performance_preference: Device or resource busy

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=219332

--- Comment #11 from Mario Limonciello (AMD) (mario.limonciello@amd.com) ---
> When `amd-pstate=active` whatever is written to
> `/sys/devices/system/cpu/cpufreq/policy0/scaling_governor` has zero effect on
> the CPU behavior/system thermals. That's what I was trying to say.

I wouldn't say zero effect - it definitely can matter.  If you start out in
powersave at a more efficiency biased EPP value then switching to performance
is going to increase power consumption and heat etc.

> I wonder if amd-pstate could "simply" hide/disable (i.e. make read-only)
> scaling_available_governors AND scaling_governor.

Userspace can still change the cpufreq governor from performance to powersave
and vice versa.  So it should not go away.

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