[Bug 32556] screen flickers all the time with desktop image appearing only briefly

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=32556

--- Comment #21 from Gildas Le Nadan <3ntr0p13 at gmail.com> 2011-01-08 15:34:32 PST ---
(In reply to comment #20)
> Created an attachment (id=41430)
 View: https://bugs.freedesktop.org/attachment.cgi?id=41430
 Review: https://bugs.freedesktop.org/review?bug=32556&attachment=41430

> adjust up the clock slightly on rs6xx TDMS
> 
> Does this patch help?

This patch seems to help when combined with "RADEON_PLL_USE_FRAC_FB_DIV |
RADEON_PLL_PREFER_CLOSEST_HIGHER |RADEON_PLL_NO_ODD_POST_DIV".

For now after a single session of 2h, it even seems more stable than ums (where
occasional losses of images happen maybe every 20-30mins on average).

I've tried other combinations as well with various success:

- RADEON_PLL_PREFER_CLOSEST_LOWER => unstable-ish
- RADEON_PLL_USE_FRAC_FB_DIV => black
- RADEON_PLL_PREFER_CLOSEST_LOWER | RADEON_PLL_USE_FRAC_FB_DIV => not very
stable
- RADEON_PLL_PREFER_CLOSEST_HIGHER => not stable
- RADEON_PLL_USE_FRAC_FB_DIV | RADEON_PLL_PREFER_CLOSEST_HIGHER => not stable

I can provide the registers for the different tests if that could be of any
uses.

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