I found https://wiki.ubuntu.com/X/Troubleshooting/HighCPU
$ glxinfo |grep render
direct rendering: Yes
OpenGL renderer string: Mesa DRI Intel(R) Sandybridge Mobile
GL_NV_conditional_render, GL_AMD_draw_buffers_blend,
killing applications one-by-one is not really an option since I cannot
reproduce the condition reliably.
/var/log/Xorg.0.log.old says:
[ 14125.830] (EE) intel(0): Detected a hung GPU, disabling acceleration.
[ 14125.830] (EE) intel(0): When reporting this, please include
i915_error_state from debugfs and the full dmesg.
/var/log/kern.log:
May 20 13:11:53 t520sds kernel: [14108.121616] [drm:i915_hangcheck_hung]
*ERROR* Hangcheck timer elapsed... GPU hung
May 20 13:11:53 t520sds kernel: [14108.121620] [drm] capturing error event;
look for more information in /debug/dri/0/i915_error_state
May 20 13:11:53 t520sds kernel: [14108.137584] [drm:__gen6_gt_force_wake_get]
*ERROR* Timed out waiting for forcewake old ack to clear.
** Summary changed:
- Xorg is pegged constantly redrawing the panel
+ GPU lockup: Xorg is pegged - constantly redrawing the panel
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https://bugs.launchpad.net/bugs/1182156
Title:
GPU lockup: Xorg is pegged - constantly redrawing the panel
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