Created attachment 73560
write mbox regs twice on snb
Another piece of magic which might help. Please test this patch and the
one from Chris ("Read back semaphore mboxes after update") separately
and report back whether anything changes.
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https://bugs.launchpad.net/bugs/1041790
Title:
[sandybridge-m-gt2] GPU lockup IPEHR: 0x0b160001 IPEHR: 0x0b140001
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