Please test with the following kernel:
http://kernel.ubuntu.com/~kernel-ppa/mainline/daily/current/
In this newer kernel code is a fix to enlarge unfenced alignments, which
appears to be a problem specific to i915/i945. If that kernel makes this
lockup bug go away, then we can investigate extracting and backporting
it. If not and we can rule out that fix for this issue, upstream (Chris
Wilson) will investigate further.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/718021
Title:
[i946gz] GPU lockup f3077a7e (ESR: 0x00000001 IPEHR: 0x87000000) -
WARNING: at /build/buildd/linux-2.6.35/mm/page_alloc.c:1986
__alloc_pages_slowpath+0x36d/0x4b0()
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