Tim: please test with sna turned on, put this in /etc/X11/xorg.conf:

Section "Device"
        Identifier "intel"
        driver "intel"
        Option "UseSna" "True"
EndSection


** Changed in: xserver-xorg-video-intel (Ubuntu)
       Status: Triaged => Incomplete

** Changed in: xserver-xorg-video-intel (Ubuntu)
     Assignee: (unassigned) => Timo Aaltonen (tjaalton)

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https://bugs.launchpad.net/bugs/1043562

Title:
  [gm45] GPU lockup EIR: 0x00000010 PGTBL_ER: 0x00000001 IPEHR:
  0x60020100

Status in “xserver-xorg-video-intel” package in Ubuntu:
  Incomplete

Bug description:
  I am running the compiz and unity from the product strategy PPA.  This
  is work that should shortly land in quantal.

  ppa:unity-team/staging

  Shortly after logging in (I'm guessing around 10 seconds, which is the
  delay before we construct the dash view inside unity), the GPU locks
  up.

  This has happened every time I have logged in since upgrading to the
  latest compiz and unity.  Restarting compiz makes no difference as it
  blocks immediately in the same place on restart.

  The solution is to restart lightdm.

  I have also had compiz crash about 10s after startup as well.  I'm
  assuming the same root cause may be there.  Ratio of crashes to
  lockups is about 2 to 1.

  Sometimes it works.

  ProblemType: Crash
  DistroRelease: Ubuntu 12.10
  Package: xserver-xorg-video-intel 2:2.20.3-0ubuntu1
  Uname: Linux 3.6.0-030600rc3-generic x86_64
  ApportVersion: 2.5.1-0ubuntu3
  Architecture: amd64
  Chipset: gm45
  Date: Thu Aug 30 10:44:08 2012
  DistroCodename: quantal
  DistroVariant: ubuntu
  DuplicateSignature: [gm45] GPU lockup  EIR: 0x00000010 PGTBL_ER: 0x00000001 
IPEHR: 0x60020100 Ubuntu 12.10
  ExecutablePath: /usr/share/apport/apport-gpu-error-intel.py
  GpuHangFrequency: Several times a day
  InterpreterPath: /usr/bin/python3.2mu
  MachineType: Micro-Star International PR420
  ProcCmdline: /usr/bin/python3 /usr/share/apport/apport-gpu-error-intel.py
  ProcEnviron:
   
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.6.0-030600rc3-generic 
root=UUID=30f7166b-fe9e-4d50-81f8-9c0566868056 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   xserver-xorg             1:7.7+1ubuntu3
   libdrm2                  2.4.38-0ubuntu2
   xserver-xorg-video-intel 2:2.20.3-0ubuntu1
  SourcePackage: xserver-xorg-video-intel
  Title: [gm45] GPU lockup  EIR: 0x00000010 PGTBL_ER: 0x00000001 IPEHR: 
0x60020100
  UdevDb: Error: [Errno 2] No such file or directory: 'udevadm'
  UpgradeStatus: Upgraded to quantal on 2012-08-03 (26 days ago)
  UserGroups:
   
  dmi.bios.date: 02/13/2009
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 080015
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: MS-1432
  dmi.board.vendor: Micro-Star International
  dmi.board.version: Ver 1.000
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Micro-Star International
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr080015:bd02/13/2009:svnMicro-StarInternational:pnPR420:pvrVer1.000:rvnMicro-StarInternational:rnMS-1432:rvrVer1.000:cvnMicro-StarInternational:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: PR420
  dmi.product.version: Ver 1.000
  dmi.sys.vendor: Micro-Star International

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