[Bug 108106] [snb] GPU HANG: ecode 6:0:0xff800fbf, in kwin_x11 & graphics corruption

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https://bugs.freedesktop.org/show_bug.cgi?id=108106

--- Comment #21 from Laurent Bonnaud <L.Bonnaud at laposte.net> ---
Created attachment 143940
  --> https://bugs.freedesktop.org/attachment.cgi?id=143940&action=edit
Graphic corruption in Ubuntu 19.04

Here is an example of corruption that I got only a few seconds after logging
in.  It occurred both with Mesa 19.0.1 and 19.0.2.

OpenGL triangles are clearly visible.

Sometimes there is no corruption but when a rectangle is displayed it is
decomposed into several triangles and there is enough delay between triangles
to notice that the rectangle is not displayed atomically.

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