[Bug 99582] [SKL] GPU HANG: ecode 9:0:0x85dffffb, in Xorg [1085], reason: Hang on render ring, action: reset

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99582

--- Comment #22 from Mark Janes <mark.a.janes at intel.com> ---
There are a few ways to accelerate 2D graphics.  For Intel hardware, you can
use:

 - SNA: xf86-video-intel, which accelerates the 2D api for Intel GPUs
 - Glamor/modesetting: implements the 2D api in OpenGL

Different distributions choose different defaults.  A GPU hang caused by Xorg
can be caused by SNA or Mesa's implementation of the GL commands sent by
Glamor.

Some Mesa GPU hangs have been recently fixed by:
180653c357d19ca88f7895f59874a58fac99cc53
Author:     Topi Pohjolainen <topi.pohjolainen at intel.com>
i965/blorp: Make post draw flush more explicit

Some SNA GPU hangs have been recently fixed by:
4acd4a7d3d2f41227022fa7581cfb85a0b124eae 
author  Chris Wilson <chris at chris-wilson.co.uk>
sna/gen9: Emit a dummy primitive between VertexElements

Make sure you use versions that have those patches.

For information on how to switch between sna and modesetting, see
https://bugs.freedesktop.org/show_bug.cgi?id=98999

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