[Bug 73067] RV770 - screen flicker with radeon.dpm=1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73067

--- Comment #10 from Alex Deucher <agd5f at yahoo.com> ---
(In reply to comment #9)
> Yes, the attached patch fixed the flicker. Screen does not flick whichever
> value is power_dpm_state or power_dpm_force_performance_level.
> 
> Before the patch, the flicker happened when switching from
> power level 2    sclk: 66500 mclk: 95000 vddc: 1082
> to
> power level 1    sclk: 50000 mclk: 70000 vddc: 1046
> 
> In the way level 1 -> level 2 there is not screen flicker.

The flicker is caused by the mclk transition.  It some cases it seems to take
longer than the vblank period which is why you are seeing the flicker.

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