[Bug 61628] [ilk] Corrupted rendering of page previews in Firefox with >xf86-video-intel-2.20.18

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=61628

--- Comment #39 from Coacher <itumaykin at gmail.com> ---
Also I've noticed that "disable read-read optimisations" patch practically does
the same as converting kgem_bo_sync__cpu_full back to kgem_bo_sync__cpu (I may
be wrong here though it looks this way to me). I will not question this as you
are developer and know best, though as tests shown only one particular branch
of kgem_bo_sync__cpu_full triggers this issue, see
kgem_bo_sync__cpu_full-revert-bad.patch. Maybe you could add some asserts in
that branch, I will apply them and give you some more info?

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