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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #12 from Alex Deucher <agd5f at yahoo.com> ---
(In reply to comment #11)
> I found that my screen was flicking once in ~4 seconds because of conky.
> With conky off, flicks happen but happen a lot less, like 1 in ~20 - this
> period depends on what I'm doing. But testing with glxspheres, screen
> flicker happens each ~4 seconds again. Probably this isn't important.
> 

It happens whenever there is an mclk transition based on GPU load.

> Can you give some hints about the solution? Do you think this can be fixed?
> Or this driver won't support mclk transition on this board?

I'm not sure how reliable mclk switching was on rv770 boards in general.  Most
rv770 boards I've seen have the same mclk for all performance levels.  You
might try adjusting the value of CG_DISPLAY_GAP_CNTL in
rv770_program_display_gap().  Maybe try R600_PM_DISPLAY_GAP_VBLANK_OR_WM or
R600_PM_DISPLAY_GAP_WATERMARK rather than R600_PM_DISPLAY_GAP_VBLANK for
DISP1_GAP_MCHG, but I don't think it will make a difference.

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