[Bug 105720] screen corruption using SNA and TearFree on Intel GeminiLake
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Wed Mar 28 00:27:58 UTC 2018
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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