[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 #153 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to comment #145)
> Created attachment 91383 [details]
> 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

Ok, I think I have this fixed:

commit 9d8473c5d9489db439aca73f470bda29a22ebab6
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Tue Jan 7 13:43:35 2014 +0000

    sna/gen4: Check for available batch space before restoring state after CA
pass

    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=73348
    References: https://bugs.freedesktop.org/show_bug.cgi?id=55500
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

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