[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 #86 from Chris Wilson <chris at chris-wilson.co.uk> ---
Whilst more than likely you are using a kernel with a known incoherency bug (as
there is yet to be a kernel release with it fixed), the effects are quite
different to the ones you captured. The issue which I believe to be behind the
distorted flickering can be quite easily triggered by simply changing the
number of rectangles submitted in a single draw call. In practice, this then
both depends upon the exact details of the rendering and its timing.

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