[Bug 80948] [sna suse] many black lines with latest ddx

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80948

--- Comment #3 from Chris Wilson <chris at chris-wilson.co.uk> ---
My suspicion is that the corruption is dirty cache lines - a missing cache
flush on the GPU, and the likely commit

commit 2bf36d54ebdfa2a59bf7ef71134b953628ae5d50
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Wed Jul 2 11:31:54 2014 +0100

    sna/gen6+: Tweak consideration of compositing on BLT

    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

I think it is not the commit that is at fault here, but an underlying issue. I
suspect I saw the corruption on first booting into master on this ivb, but
haven't seen it again, nor reproduced it on another machine (snb/ivb). It is
likely to depend critically on render path, GPU state and memory states.

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