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[bugbot <727594@xxxxxxxxxxxxxxxxxx>]

** Description changed:

  [Impact]
  Severe GPU lockup affecting the i915/i945 family of Intel chips, resulting in unrecoverable freeze of graphics, black screen and/or corruption, requiring a hard reboot to reset.  The issue is widespread amongst these cards as evidenced by the large number of dupes; the hardware is common.  Most users report this is a regression in behavior from maverick.
  
  [Background]
  Subsequent to the code included in maverick, upstream introduced an optimization to relax fencing on Intel hardware.  This change reduced the amount of memory allocated for video buffers.  However on older (pre-G33) hardware such as i915/i945 this results in increased chances of GPU lockups. 
  
  [Fix for Development Version]
  Upstream has opted to disable the relaxed fencing optimization for their driver release, and the change is still present in their active upstream git tree.  Thus, we will be pulling this fix when we update X in oneiric.
  
  [Fix for Stable Version]
  For natty, the attached patch is a backport of the patch that went upstream.  This patch makes relaxed fencing into an xorg.conf option that can be set, and makes it disabled by default for gen < 33 chipsets.
  
  [Steps to Reproduce]
  The freezes typically occur intermittently after some period of use.  For some people it occurs right at boot, others after minutes or hours of usage.  Some users find that certain activities such as web browsing makes the issue more likely to occur, but others do not find it correlated to any particular action.
  
  However, in all cases once the system is frozen, the file
  /sys/kernel/debug/dri/0/i915_error_state will contain an error code for
  the IPEHR value.  The exact value appears to vary greatly from hw to hw,
  but common values tend to be either in the 0x02xxxxxx or 0x7xxxxxxx
  range.
  
  With this patch applied, gpu freezes should either go away entirely, or
  become much less frequent.  Freezes which still occur but have IPEHR
  values outside these two ranges may be unrelated bugs.
  
  [Regression Potential]
  The patch itself is relatively small and unlikely to introduce regression.
  
  However, this switches optimization paths within the driver.  It
  restores us to an older codepath so presumably this will at least be as
  stable as maverick, however the amount of testing this path has received
  on natty is limited.  The code is upstream and being tested by the wider
  community and so far has not proven problematic.
  
  Because it is disabling an optimization, it is possible some users of
  older hardware may see performance regress, but should be no worse than
  what was available in maverick.
  
  
  [Original Report]
  As instructed by Bryce I installed the following kernel on my Asus eee pc 701 running natty:
  " Please test with the following kernel:
  
    http://kernel.ubuntu.com/~kernel-ppa/mainline/daily/current/ "
  
  by doing sudo dpkg -i linux-image....deb
  
  Then I ran update manager.
  
  After rebooting I browsed with google chrome. The system froze after 5
  minutes.
  
  I rebooted the same kernel and immediately got this problem popup. In
  addition there is font corruption - part of the letter t is missing in
  the browser.
  
  ProblemType: Crash
  DistroRelease: Ubuntu 11.04
  Package: xserver-xorg-video-intel 2:2.14.0-1ubuntu11
  Uname: Linux 2.6.38-999-generic i686
  Architecture: i386
  Chipset: i915gm
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  DRM.card0.LVDS.1:
   status: connected
   enabled: enabled
   dpms: On
   modes: 800x480
   edid-base64:
  DRM.card0.VGA.1:
   status: connected
   enabled: enabled
   dpms: On
   modes: 1680x1050 1280x1024 1280x1024 1280x960 1152x864 1024x768 1024x768 1024x768 832x624 800x600 800x600 800x600 800x600 640x480 640x480 640x480 640x480 720x400
   edid-base64: AP///////wBMLX4CMjJFTQ4RAQMOLx54KtUVpFVJmicUUFS/74CzAIGAgUBxTwEBAQEBAQEBfC6QoGAaHkAwIDYA2igRAAAaAAAA/QA4Sx5RDgAKICAgICAgAAAA/ABTeW5jTWFzdGVyCiAgAAAA/wBIOU5QNDAwMTk3CiAgAM8=
  Date: Wed Mar  2 15:23:13 2011
  DistUpgraded: Yes, recently upgraded Log time: 2011-02-17 19:00:58.983764
  DistroCodename: natty
  DistroVariant: ubuntu
  DumpSignature: c38b9ae8 (ESR: 0x00000001 IPEHR: 0x02000004)
  ExecutablePath: /usr/share/apport/apport-gpu-error-intel.py
  GraphicsCard:
   Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller [8086:2592] (rev 04) (prog-if 00 [VGA controller])
     Subsystem: ASUSTeK Computer Inc. Device [1043:82d9]
     Subsystem: ASUSTeK Computer Inc. Device [1043:82d9]
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha i386 (20110202)
  InterpreterPath: /usr/bin/python2.7
  MachineType: ASUSTeK Computer INC. 701
  ProcCmdline: /usr/bin/python /usr/share/apport/apport-gpu-error-intel.py
  ProcEnviron:
  
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-999-generic root=UUID=3893e3fd-c2b4-40ec-9810-5a9aba86cbd4 ro crashkernel=384M-2G:64M,2G-:128M quiet splash vt.handoff=7
  ProcKernelCmdLine_: BOOT_IMAGE=/boot/vmlinuz-2.6.38-999-generic root=UUID=3893e3fd-c2b4-40ec-9810-5a9aba86cbd4 ro crashkernel=384M-2G:64M,2G-:128M quiet splash vt.handoff=7
  RelatedPackageVersions:
   xserver-xorg             1:7.6~3ubuntu8
   libdrm2                  2.4.23-1ubuntu3
   xserver-xorg-video-intel 2:2.14.0-1ubuntu11
  Renderer: Unknown
  SourcePackage: xserver-xorg-video-intel
  Title: [i915gm] GPU lockup c38b9ae8 (ESR: 0x00000001 IPEHR: 0x02000004)
  UpgradeStatus: Upgraded to natty on 2011-02-24 (5 days ago)
  UserGroups:
  
  dmi.bios.date: 05/04/2008
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1001
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: 701
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: x.xx
  dmi.chassis.asset.tag: 0x00000000
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTek Computer INC.
  dmi.chassis.version: x.x
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1001:bd05/04/2008:svnASUSTeKComputerINC.:pn701:pvrx.x:rvnASUSTeKComputerINC.:rn701:rvrx.xx:cvnASUSTekComputerINC.:ct10:cvrx.x:
  dmi.product.name: 701
  dmi.product.version: x.x
  dmi.sys.vendor: ASUSTeK Computer INC.
  version.compiz: compiz 1:0.9.4-0ubuntu3
  version.libdrm2: libdrm2 2.4.23-1ubuntu3
  version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.1~git20110215.cc1636b6-0ubuntu2
  version.xserver-xorg: xserver-xorg 1:7.6~3ubuntu8
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.0-0ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.14.0-1ubuntu11
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110107+b795ca6e-0ubuntu5
+ 
+ [lspci]
+ Nux: lspci: 00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller [8086:2592] (r

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https://bugs.launchpad.net/bugs/727594

Title:
  SRU: [i915gm] GPU lockup (ESR: 0x00000001 IPEHR: 0x02000004)