[Bug 85021] radeon: Allow one to set "mid" to power_dpm_force_performance_level

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=85021

--- Comment #2 from higuita <higuita@gmx.net> ---
Auto will jump from level 0 to level 2, i never see level 1 being used in any
place/app other than a maximized glxgears.

tvtime or chrome+youtube+thml5 will jump the level from 0 to 2, but if i force
low i see no problem at all, no drop frames, no lag. Only if i try to open more
things at same time (many terminals doing dmesg, many videos playing, some 3d
game) it starts to get slower. 
so clearly the high is too much, low is enough for most use cases and mid would
be perfect.  Auto will not put it in mid.

That is why i wanted to manually setup the mid level, the computer keeps cool
and the gpu power is good enough for almost all load (other than heavy 3D
games)

also, its a little strange that low and high is supported in dpm setting, but
not the mid... profile setting had the low, mid, high and the auto

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