it's one of these commits (from the quantal kernel), likely the top one
since it's happening on sandybridge:
817e8fdee14b05d drm/i915: Implement WaDisableHiZPlanesWhenMSAAEnabled
4c443ec9afe7f6f drm/i915: GFX_MODE Flush TLB Invalidate Mode must be '1' for
scanline waits
f534135423c7028 drm/i915: Disable AsyncFlip performance optimisations
c0c1fd8a18479f0 drm/i915: Invalidate the relocation presumed_offsets along the
slow path
** Changed in: linux (Ubuntu)
Importance: Medium => Critical
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Ubuntu Kernel Team (ubuntu-kernel-team)
** Also affects: linux (Ubuntu Precise)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Quantal)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Raring)
Importance: Critical
Assignee: Ubuntu Kernel Team (ubuntu-kernel-team)
Status: Confirmed
** Changed in: linux (Ubuntu Quantal)
Importance: Undecided => Critical
** Changed in: linux (Ubuntu Quantal)
Status: New => Confirmed
** Changed in: linux (Ubuntu Precise)
Importance: Undecided => Critical
** Changed in: linux (Ubuntu Precise)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1140716
Title:
[regression] 3.5.0-26-generic GPU hangs
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