render error detected，这个BUG，从13.10开始就有。

[id0612]

[ 11.628703] [drm] GPU crash dump saved to /sys/class/drm/card0/error
[ 11.628707] [drm] GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.
[ 11.628709] [drm] Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel
[ 11.628710] [drm] drm/i915 developers can then reassign to the right component if it's not a kernel issue.
[ 11.628712] [drm] The gpu crash dump is required to analyze gpu hangs, so please always attach it.
[ 11.629355] i915: render error detected, EIR: 0x00000010
[ 11.629361] i915: IPEIR: 0x00000000
[ 11.629363] i915: IPEHR: 0x00000000
[ 11.629366] i915: INSTDONE_0: 0xfffffffe
[ 11.629368] i915: INSTDONE_1: 0xffffffff
[ 11.629370] i915: INSTDONE_2: 0x00000000
[ 11.629372] i915: INSTDONE_3: 0x00000000
[ 11.629374] i915: INSTPS: 0x00000000
[ 11.629376] i915: ACTHD: 0x00000000
[ 11.629378] i915: page table error
[ 11.629380] i915: PGTBL_ER: 0x00100000
[ 11.629385] [drm:i915_report_and_clear_eir] *ERROR* EIR stuck: 0x00000010, masking