[Bug 75394] System hangs randomly with error message: [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... render ring idle

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75394

--- Comment #49 from Chris <cpollock at embarqmail.com> ---
And again this happens less than 24hrs later still with kernel
3.13.0-46-generic #76-Ubuntu SMP Thu Feb 26 18:52:13 UTC 2015 x86_64 x86_64
x86_64 GNU/Linux. I was able to drop to a terminal with CTRL-ALT-F1 this time
as it locked up in Firefox. 

Mar  2 07:35:38 localhost kernel: [71138.820009] [drm:i915_hangcheck_elapsed]
*ERROR* Hangcheck timer elapsed... render ring idle

Portion of kern.log when lockup happened:

Mar  2 07:35:38 localhost kernel: [71138.820009] [drm:i915_hangcheck_elapsed]
*ERROR* Hangcheck timer elapsed... render ring idle
Mar  2 07:36:23 localhost kernel: [71184.699897] [drm:intel_crtc_cursor_set],
cursor off
Mar  2 07:36:24 localhost kernel: [71185.780637] [drm:intel_crtc_set_config],
[CRTC:3] [FB:37] #connectors=1 (x y) (0 0)
Mar  2 07:36:24 localhost kernel: [71185.780641]
[drm:intel_set_config_compute_mode_changes], computed changes for [CRTC:3],
mode_changed=0, fb_changed=1
Mar  2 07:36:24 localhost kernel: [71185.780644]
[drm:intel_modeset_stage_output_state], [CONNECTOR:5:VGA-1] to [CRTC:3]
Mar  2 07:36:24 localhost kernel: [71185.780656] [drm:i9xx_update_plane],
Writing base 00046000 00000000 0 0 6720
Mar  2 07:36:24 localhost kernel: [71185.788019] [drm:intel_crtc_set_config],
[CRTC:4] [NOFB]
Mar  2 07:36:24 localhost kernel: [71185.788021]
[drm:intel_set_config_compute_mode_changes], computed changes for [CRTC:4],
mode_changed=0, fb_changed=0
Mar  2 07:36:24 localhost kernel: [71185.788023]
[drm:intel_modeset_stage_output_state], [CONNECTOR:5:VGA-1] to [CRTC:3]
Mar  2 07:36:24 localhost kernel: [71185.788026] [drm:intel_crtc_set_config],
[CRTC:3] [FB:37] #connectors=1 (x y) (0 0)
Mar  2 07:36:24 localhost kernel: [71185.788029]
[drm:intel_set_config_compute_mode_changes], computed changes for [CRTC:3],
mode_changed=0, fb_changed=0
Mar  2 07:36:24 localhost kernel: [71185.788031]
[drm:intel_modeset_stage_output_state], [CONNECTOR:5:VGA-1] to [CRTC:3]
Mar  2 07:36:24 localhost kernel: [71185.788042] [drm:intel_crtc_set_config],
[CRTC:3] [FB:37] #connectors=1 (x y) (0 0)
Mar  2 07:36:24 localhost kernel: [71185.788044]
[drm:intel_set_config_compute_mode_changes], computed changes for [CRTC:3],
mode_changed=0, fb_changed=0
Mar  2 07:36:24 localhost kernel: [71185.788046]
[drm:intel_modeset_stage_output_state], [CONNECTOR:5:VGA-1] to [CRTC:3]

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