As noted by Timo, a fix has been released and I confirm that the bug has
dissapeared in the latest kernel.

** Changed in: linux (Ubuntu)
       Status: Incomplete => Fix Released

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https://bugs.launchpad.net/bugs/983146

Title:
  [sandybridge-m-gt2+] GPU lockup  render.IPEHR: 0xd208b6d0

Status in X.org xf86-video-intel:
  Fix Released
Status in “linux” package in Ubuntu:
  Fix Released
Status in “xserver-xorg-video-intel” package in Ubuntu:
  Fix Released

Bug description:
  Since the precise installation the system is having problem with the video 
display. Sometimes there's corruption in the screen and sometimes random hangs 
of the X server. Usually the computer can be recovered by restarting lightgdm 
and rebooting afterwards.
  The computer is a macmini (mid 2011 model) and precise (beta 2) has been 
installed without using bootcamp (no BIOS emulation).

  ProblemType: Crash
  DistroRelease: Ubuntu 12.04
  Package: xserver-xorg-video-intel 2:2.17.0-1ubuntu4
  ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
  Uname: Linux 3.2.0-23-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.0.1-0ubuntu3
  Architecture: amd64
  Chipset: sandybridge-m-gt2+
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  Date: Mon Apr 16 16:59:48 2012
  DistUpgraded: Fresh install
  DistroCodename: precise
  DistroVariant: ubuntu
  DuplicateSignature: [sandybridge-m-gt2+] GPU lockup  render.IPEHR: 0xd208b6d0 
Ubuntu 12.04
  ExecutablePath: /usr/share/apport/apport-gpu-error-intel.py
  ExtraDebuggingInterest: Yes, whatever it takes to get this fixed in Ubuntu
  GpuHangFrequency: Several times a day
  GpuHangReproducibility: Seems to happen randomly
  GpuHangStarted: Immediately after installing this version of Ubuntu
  GraphicsCard:
   Intel Corporation 2nd Generation Core Processor Family Integrated Graphics 
Controller [8086:0126] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Apple Inc. Device [106b:00e6]
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120328)
  InterpreterPath: /usr/bin/python2.7
  MachineType: Apple Inc. Macmini5,1
  ProcCmdline: /usr/bin/python /usr/share/apport/apport-gpu-error-intel.py
  ProcEnviron:
   
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-23-generic 
root=UUID=5228f36e-20df-43f4-8707-a6f7325e7535 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   xserver-xorg             1:7.6+12ubuntu1
   libdrm2                  2.4.32-1ubuntu1
   xserver-xorg-video-intel 2:2.17.0-1ubuntu4
  SourcePackage: xserver-xorg-video-intel
  Title: [sandybridge-m-gt2+] GPU lockup  render.IPEHR: 0xd208b6d0
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  dmi.bios.date: 01/24/2012
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MM51.88Z.0077.B10.1201241549
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-8ED6AF5B48C039E1
  dmi.board.vendor: Apple Inc.
  dmi.board.version: Macmini5,1
  dmi.chassis.type: 16
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-8ED6AF5B48C039E1
  dmi.modalias: 
dmi:bvnAppleInc.:bvrMM51.88Z.0077.B10.1201241549:bd01/24/2012:svnAppleInc.:pnMacmini5,1:pvr1.0:rvnAppleInc.:rnMac-8ED6AF5B48C039E1:rvrMacmini5,1:cvnAppleInc.:ct16:cvrMac-8ED6AF5B48C039E1:
  dmi.product.name: Macmini5,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.
  version.compiz: compiz 1:0.9.7.6-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.32-1ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.2-0ubuntu3
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.2-0ubuntu3
  version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu10
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 
1:6.14.99~git20111219.aacbd629-0ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:0.0.16+git20111201+b5534a1-1build2

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