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[Philipp Meier <851345@xxxxxxxxxxxxxxxxxx>]

At least for me it does not sound familiar to bug #864054 as everything from update to synaptic to external drives is working properly. Just the 3d-acceleartion did stop and therefore unity-2d is running. But the hardware is fully capable of 3d acceleration and a different kernel did not help at all.
The bug was once fixed by an update of lightdm as you can see above.

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https://bugs.launchpad.net/bugs/851345

Title:
  compiz crashes on i915 graphic module with GLX_EXT_texture_from_pixmap
  is missing

Status in Unity:
  Invalid
Status in “compiz” package in Ubuntu:
  Invalid
Status in “lightdm” package in Ubuntu:
  Confirmed
Status in “compiz” source package in Oneiric:
  Invalid
Status in “lightdm” source package in Oneiric:
  Confirmed

Bug description:
  Ubuntu 11.10:
  unity: 4.20.0-0ubuntu2
  compiz:  1:0.9.6+bzr20110929-0ubuntu1
  xorg: 1:7.6+7ubuntu7
  linux-image-generic: 3.0.0.12.19
  lightdm: 1.0.0-0ubuntu4

  Since today’s updates compiz does not load any more. When i try to log into unity-3d it quickly blinks with the following error message:
  compiz --replace &

  Backend     : gconf
  Integration : true
  Profile     : unity
  Adding plugins
  Skipping upgrade com.canonical.unity.unity.01.upgrade
  Skipping upgrade com.canonical.unity.unity.02.upgrade
  Initializing core options...done
  Initializing bailer options...done
  Initializing detection options...done
  Initializing composite options...done
  Compiz (opengl) - Fatal: GLX_EXT_texture_from_pixmap is missing
  Compiz (opengl) - Fatal: Software rendering detected
  Compiz (bailer) - Info: Ensuring a shell for your session

  But my hardware was absolutely fine with 3d acceleration before today.

  lspci -v:
  00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Device 20e4
   Flags: bus master, fast devsel, latency 0, IRQ 43
   Memory at f0000000 (64-bit, non-prefetchable) [size=4M]
   Memory at d0000000 (64-bit, prefetchable) [size=256M]
   I/O ports at 1800 [size=8]
   Expansion ROM at <unassigned> [disabled]
   Capabilities: <access denied>
   Kernel driver in use: i915
   Kernel modules: i915

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: compiz 1:0.9.5.94+bzr2803-0ubuntu5
  ProcVersionSignature: Ubuntu 3.0.0-11.18-generic 3.0.4
  Uname: Linux 3.0.0-11-generic x86_64
  .tmp.unity.support.test.0:

  ApportVersion: 1.23-0ubuntu1
  Architecture: amd64
  CompizPlugins: [core,bailer,detection,composite,opengl,decor,mousepoll,vpswitch,regex,animation,snap,expo,move,compiztoolbox,place,grid,imgpng,gnomecompat,wall,ezoom,workarounds,resize,fade,unitymtgrabhandles,scale,session,unityshell]
  CompositorRunning: None
  Date: Thu Sep 15 23:00:56 2011
  DistUpgraded: Log time: 2011-09-13 18:19:39.302686
  DistroCodename: oneiric
  DistroVariant: ubuntu
  DkmsStatus:
   vboxhost, 4.1.2, 3.0.0-11-generic, x86_64: installed (WARNING! Diff between built and installed module!) (WARNING! Diff between built and installed module!)
   virtualbox, 4.1.2, 3.0.0-11-generic, x86_64: installed (WARNING! Diff between built and installed module!) (WARNING! Diff between built and installed module!)
  EcryptfsInUse: Yes
  GraphicsCard:
   Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a42] (rev 07) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:20e4]
     Subsystem: Lenovo Device [17aa:20e4]
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20110302)
  MachineType: LENOVO 2774A29
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=de:en
   PATH=(custom, no user)
   LANG=de_CH.UTF-8
   LC_MESSAGES=de_DE.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-11-generic root=UUID=7cec099f-15dd-4509-ba10-033af14b1600 ro quiet splash pcie_aspm=force vt.handoff=7
  SourcePackage: compiz
  UpgradeStatus: Upgraded to oneiric on 2011-09-13 (2 days ago)
  dmi.bios.date: 12/10/2010
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6EET54WW (3.14 )
  dmi.board.name: 2774A29
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr6EET54WW(3.14):bd12/10/2010:svnLENOVO:pn2774A29:pvrThinkPadX301:rvnLENOVO:rn2774A29:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 2774A29
  dmi.product.version: ThinkPad X301
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.5.94+bzr2803-0ubuntu5
  version.ia32-libs: ia32-libs 20090808ubuntu21
  version.libdrm2: libdrm2 2.4.26-1ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 7.11-0ubuntu3
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 7.11-0ubuntu3
  version.xserver-xorg: xserver-xorg 1:7.6+7ubuntu7
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.0-1ubuntu13
  version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.15.901-1ubuntu2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110411+8378443-1

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