[Bug 55500] [sna gen4] corrupt rendering (including wrong rendering of characters and flickering on redraw)

[bugzilla-daemon at freedesktop.org]

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

--- Comment #126 from Chris Wilson <chris at chris-wilson.co.uk> ---
The tests are intentionally overkill - they are also intended to try and test
handling of large batches, as well as generally stress the system.

I hadn't noticed the basic-copyarea fail. That does look to be different. So
far, the failure pattern had seemed to be a subspan doesn't get written (i.e. a
single instance of one thread failed to execute correctly in the GPU, which I
think could explain the general bug here.) basic-copyarea looks like a larger
scale failure. And, yes, it does fail on my gm45 as well.

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