[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 #136 from Chris Wilson <chris at chris-wilson.co.uk> ---
The issue that the VUE (which is a memory slot used by the GPU for a vertex
entry) are reused by a second thread before the first thread is complete,
causing the first thread to generate invalid texture coordinates and corrupt
rendering. That is a hardware read-write hazard bug (or at least I have not
found any controls in the EU state to prevent it).

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