[Bug 309235] New: X Freezing & Crashing when using UXA accel with OpenGL Rendering

[Axel FIlisola]

https://bugs.kde.org/show_bug.cgi?id=309235

            Bug ID: 309235
          Severity: critical
           Version: 4.9
          Priority: NOR
          Assignee: unassigned-bugs at kde.org
           Summary: X Freezing & Crashing when using UXA accel with OpenGL
                    Rendering
    Classification: Unclassified
                OS: Linux
          Reporter: axelectrik at hotmail.com
          Hardware: Archlinux Packages
            Status: UNCONFIRMED
         Component: general
           Product: kde

I actually use chipset i915 with Intel Graphics (Ivy Bridge)
(xf86-video-intel-2.20.12-1) configured with UXA (stock) acceleration.
When using OpenGL for desktop effects rendering there are graphical
curroptions, such as tearing and while line borders around some dock
(avant-window-navigator) icons. 
After some time, it produces GPU hangs (as read in /var/log/erros.log) lasting
sometimes seconds, sometimes freezing X completly and in some rare occations,
crashing (interrupting the signal to the monitor, and without the options to
switch to console mode or do any hot key command at all) leaving as only option
to reset.
This problem is not presented when using SNA acceleration, or using XRender for
rendering. 

Reproducible: Sometimes

Steps to Reproduce:
1.Set "UXA" as acceleration method and OpenGL for desktop rendering
2. Just work, borwse the web or any other task
3. The screen starts to freeze and erros.log show the "GPU hang" legend
Actual Results:  
The sme, Xfreezes or crash

Expected Results:  
Keep working smoothly

/var/log/errors.log output::
Oct 28 20:48:15 wonderland kernel: [  310.600146] [drm:i915_hangcheck_hung]
*ERROR* Hangcheck timer elapsed... GPU hung
Oct 28 20:48:21 wonderland kernel: [  316.746913] [drm:i915_hangcheck_hung]
*ERROR* Hangcheck timer elapsed... GPU hung
Oct 28 20:48:27 wonderland kernel: [  322.757235] [drm:i915_hangcheck_hung]
*ERROR* Hangcheck timer elapsed... GPU hung
Oct 28 20:48:33 wonderland kernel: [  328.814145] [drm:i915_hangcheck_hung]
*ERROR* Hangcheck timer elapsed... GPU hung
Oct 28 20:48:39 wonderland kernel: [  334.867729] [drm:i915_hangcheck_hung]
*ERROR* Hangcheck timer elapsed... GPU hung
Oct 28 20:48:45 wonderland kernel: [  341.124319] [drm:i915_hangcheck_hung]
*ERROR* Hangcheck timer elapsed... GPU hung
Oct 28 20:48:51 wonderland kernel: [  347.174575] [drm:i915_hangcheck_hung]
*ERROR* Hangcheck timer elapsed... GPU hung
Oct 28 20:49:24 wonderland kernel: [  379.632300] [drm:i915_hangcheck_hung]
*ERROR* Hangcheck timer elapsed... GPU hung
Oct 28 20:49:30 wonderland kernel: [  385.685883] [drm:i915_hangcheck_hung]
*ERROR* Hangcheck timer elapsed... GPU hung
Oct 28 20:49:36 wonderland kernel: [  391.925834] [drm:i915_hangcheck_hung]
*ERROR* Hangcheck timer elapsed... GPU hung
Oct 28 20:49:42 wonderland kernel: [  397.949466] [drm:i915_hangcheck_hung]
*ERROR* Hangcheck timer elapsed... GPU hung
Oct 28 20:49:48 wonderland kernel: [  404.069608] [drm:i915_hangcheck_hung]
*ERROR* Hangcheck timer elapsed... GPU hung
Oct 28 20:49:54 wonderland kernel: [  410.186423] [drm:i915_hangcheck_hung]
*ERROR* Hangcheck timer elapsed... GPU hung

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