[Bug 55500] [sna gen4 w/a] 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 #145 from Edward Sheldrake <ejsheldrake at gmail.com> ---
Created attachment 91383
  --> https://bugs.freedesktop.org/attachment.cgi?id=91383&action=edit
gedit in openbox with 2.99.907 GM45 SNA

I am finding that GM45 SNA seems unusable with 2.99.907 - git bisect pointed to
the bad commit as:
9289e2c56b7f0cc78c5123691ad96611f0e04bed is the first bad commit
commit 9289e2c56b7f0cc78c5123691ad96611f0e04bed
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Mon Dec 16 11:39:20 2013 +0000

    sna/gen4: Sacrifice performance to workaround render corruption

The problems are lines of text keep disappearing (and reappearing) in gedit,
and the occasionally the screen becomes unresponsive for a short time and these
messages appear in dmesg:

[ 1702.349954] [drm] stuck on render ring
[ 1702.349966] [drm] capturing error event; look for more information in
/sys/class/drm/card0/error
[ 1702.354334] [drm:i915_set_reset_status] *ERROR* render ring hung inside bo
(0x32a1000 ctx 0) at 0x32a1110

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