[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 #13 from Chris Wilson <chris at chris-wilson.co.uk> ---
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

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

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)

- 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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