915: [drm] stuck on render ring

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At a ThinkPad T420 with i915 and kernel 3.12.13 my watchdog scripts told me :

Mar 6 18:45:02 n22 kernel: [drm] stuck on render ring Mar 6 18:45:02 n22 kernel: [drm] stuck on blitter ring Mar 6 18:45:02 n22 kernel: [drm] capturing error event; look for more information in /sys/class/drm/card0/error

The content of the first 1000 lines of /sys/class/drm/card0/error is attached.

- -- MfG/Sincerely Toralf Förster pgp finger print:1A37 6F99 4A9D 026F 13E2 4DCF C4EA CDDE 0076 E94E