Please collect a full backtrace when the crash occurs - see
http://wiki.ubuntu.com/X/Backtracing for directions.

This looks interesting:

(WW) intel(0): ESR is 0x00000010, page table error
(WW) intel(0): PGTBL_ER is 0x00000010, display A pte
(WW) intel(0): PRB0_CTL (0x0001f001) indicates ring buffer enabled
(WW) intel(0): PRB0_HEAD (0xaba111e4) and PRB0_TAIL (0x000111f0) indicate ring 
buffer not flushed
(WW) intel(0): Existing errors found in hardware state.

-- 
Random crashes on 915GM
https://bugs.launchpad.net/bugs/228431
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