[Bug 55500] [sna gen4] corrupt rendering (and flickering on redraw)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=55500

--- Comment #87 from Zdenek Kabelac <zdenek.kabelac at gmail.com> ---
Created attachment 82127
  --> https://bugs.freedesktop.org/attachment.cgi?id=82127&action=edit
Scroll with intel_gpu_top

I've captured video when problem appears and when doesn't
(Attaching only frame)

Using some past kernel 3.10 b2c311075db578f1433d9b303698491bfa21279a
(as of now - current vanilla)

Using current xf86 tree 5aaab9ea0310d48bb1a1ca20308d1c9721a9de3f
(as of now)

Running Firefox scroll when I've managed to trigger problem
(seem opening a lot of pages with small icons on them helps to speedup this
process)

As could be seen - intel_gpu_top shows quite high usage there.
Machine has been otherwise unloaded.
During scrolling those percentages were quite the same.

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