[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 #15 from Clinton Taylor <clinton.a.taylor at intel.com> ---
(In reply to Chris Wilson from comment #13)
> So far:
> 
> - observed it in TearFree
> 
> - not observed it in NoTearFree
> 
> - we've nullified damage tracking for TearFree, forcing it to copy every
> frame,
> still reproduces (probably sensible to check through the debug logs for this
> one to verify the copy to a fresh bo)
> 
> - used PerCrtcPixmaps + TearFree, reproduced
> 
> - used PerCrtcPixmaps + NoTearFree + attached patch (c12), reproduced

Haven't been able to reproduce with this configuration again. However the last
reproduction took over 20 minutes. Will continue testing.

> 
> (Please double check the above, and make sure the log file reports using
> PerCrtcPixmap/TearFree etc.)

Confirmed in logs that the Options are being used correctly.

> 
> So everything above that involves a pageflip (the ratelimit patch includes a
> pageflip to itself for timing purposes) has reproduced the _persistent_ dirt.
> 
> Left to verify,
> 
> - PerCrtcPixmaps + NoTearFree (not using attached patch)

Issue not seen. Rendering appears to be in order and double buffered with the
extra crtc pixmap. Need to run this config more to validate.

> 
> - Forcing a full CRTC copy with PerCrtcPixmaps + NoTearFree (requires
> another hack)
> 
> Other things to test (if it is pageflip related), fullscreen DRI2/DRI3
> applications (needs to watch HW or logs to confirm pageflips).

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