Public bug reported: IIRC this happens in something to do with OpenGL but I don't know how to find the whole stacktrace, is it logged somewhere? Let me know what I can do to provide more information to debug this.
I have an ATI HD 6950 with latest proprietary drivers installed. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: xorg 1:7.6+12ubuntu1 ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14 Uname: Linux 3.2.0-23-generic x86_64 NonfreeKernelModules: fglrx .tmp.unity.support.test.0: ApportVersion: 2.0.1-0ubuntu3 Architecture: amd64 CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell] CompositorRunning: compiz Date: Mon Apr 16 20:11:44 2012 DistUpgraded: 2012-04-06 12:10:53,922 DEBUG enabling apt cron job DistroCodename: precise DistroVariant: ubuntu ExtraDebuggingInterest: Yes, whatever it takes to get this fixed in Ubuntu GraphicsCard: Advanced Micro Devices [AMD] nee ATI Cayman PRO [Radeon HD 6950] [1002:6719] (prog-if 00 [VGA controller]) Subsystem: Advanced Micro Devices [AMD] nee ATI Device [1002:0b00] InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012) JockeyStatus: xorg:fglrx_updates - ATI/AMD proprietary FGLRX graphics driver (post-release updates) (Proprietary, Disabled, Not in use) xorg:fglrx - ATI/AMD proprietary FGLRX graphics driver (Proprietary, Disabled, Not in use) ProcEnviron: PATH=(custom, user) LANG=en_US.UTF-8 SHELL=/bin/bash ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-23-generic root=UUID=7b2f96e2-c9ae-49ac-bad2-803ab58fa702 ro quiet splash vt.handoff=7 SourcePackage: xorg Symptom: display UpgradeStatus: Upgraded to precise on 2012-04-06 (10 days ago) dmi.bios.date: 03/27/2012 dmi.bios.vendor: Intel Corp. dmi.bios.version: SIX7910J.86A.0460.2012.0327.1627 dmi.board.asset.tag: Base Board Asset Tag dmi.board.name: DX79TO dmi.board.vendor: Intel Corporation dmi.board.version: AAG28805-400 dmi.chassis.type: 3 dmi.modalias: dmi:bvnIntelCorp.:bvrSIX7910J.86A.0460.2012.0327.1627:bd03/27/2012:svn:pn:pvr:rvnIntelCorporation:rnDX79TO:rvrAAG28805-400:cvn:ct3:cvr: version.compiz: compiz 1:0.9.7.6-0ubuntu1 version.fglrx-installer: fglrx-installer N/A version.ia32-libs: ia32-libs 20090808ubuntu35 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 ** Affects: xorg (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug compiz-0.9 precise ubuntu -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/983581 Title: null reference error at shutdown/logoff To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/983581/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp