[Bug 105720] screen corruption using SNA and TearFree on Intel GeminiLake

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105720

--- Comment #22 from Clinton Taylor <clinton.a.taylor at intel.com> ---
(In reply to Martin Peres from comment #19)
> Created attachment 138397 [details] [review]
> Diff needed to fix the issue, to be applied on top of
> 6c1e70ca4234a5ab23fcdb3735fc55ac7939c52c (current HEAD)
> 
> So, the root window is getting corrupted even when using tripple buffering,
> which means the root window would never re-use buffers created by SNA.
> 
> To rule out anything related to the HW, we tried using as much fallback code
> as possible using Option "AccelMethod" "none" (Chris' suggestion).
> 
> Instead of fixing the problem, it made it extremely easy to reproduce. Chris
> asked for a full debug log (--enable-debug=full), which I could not get
> because SNA would hit an assert. Once commented out, I could produce a trace
> for Chris to read.
> 
> He found an issue using the trace and wrote a one-liner that seem to fix the
> problem. The only problem is that Chris does not understand why this fixes
> the issue at hand...
> 
> I am still posting the information now, for other parties to try to
> reproduce.

Patch does not fix the issue. Sometimes the issue can not be reproduced over
several hours. 

What was your xorg.conf Options during your testing?

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