Public bug reported: Symptoms: All of a sudden the screen is black, and the computer restarts back to the login screen.
Note: It's a full restart, not just the X server which crashes. I'm not using proprietary graphics drivers, and effects are thus disabled (i.e., I'm using Unity2D). One possible clue: It's now happened several times while I tried to install Ubuntu 12.04 as a guest OS in VirtualBox. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: xorg 1:7.6+12ubuntu2 ProcVersionSignature: Ubuntu 3.2.0-38.61-generic 3.2.37 Uname: Linux 3.2.0-38-generic x86_64 ApportVersion: 2.0.1-0ubuntu17.1 Architecture: amd64 CompizPlugins: [core,bailer,detection,composite,opengl,decor,grid,place,compiztoolbox,move,mousepoll,gnomecompat,session,wall,regex,resize,imgpng,animation,vpswitch,snap,fade,expo,workarounds,unitymtgrabhandles,scale,ezoom,unityshell] CompositorRunning: None Date: Mon Mar 18 12:37:13 2013 DistUpgraded: 2012-04-27 11:01:55,113 DEBUG enabling apt cron job DistroCodename: precise DistroVariant: ubuntu DkmsStatus: nvidia-current, 295.40, 3.2.0-38-generic, x86_64: installed virtualbox, 4.1.12, 3.2.0-30-generic, x86_64: installed virtualbox, 4.1.12, 3.2.0-34-generic, x86_64: installed virtualbox, 4.1.12, 3.2.0-35-generic, x86_64: installed virtualbox, 4.1.12, 3.2.0-38-generic, x86_64: installed ExtraDebuggingInterest: Yes, if not too technical GraphicsCard: Advanced Micro Devices [AMD] nee ATI RS780L [Radeon HD 3000] [1002:9616] (prog-if 00 [VGA controller]) Subsystem: Giga-byte Technology Device [1458:d000] InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012) MachineType: Gigabyte Technology Co., Ltd. GA-MA78LMT-US2H MarkForUpload: True ProcEnviron: TERM=xterm PATH=(custom, no user) LANG=da_DK.UTF-8 SHELL=/bin/bash ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-38-generic root=UUID=b3995a77-2c3d-4989-bdd0-0e45c2a6b45a ro quiet splash vt.handoff=7 SourcePackage: xorg Symptom: display Title: Xorg crash UnitySupportTest: Error: command ['/usr/lib/nux/unity_support_test', '-p', '-f'] failed with exit code 5: Xlib: extension "GLX" missing on display ":0". Error: GLX is not available on the system UpgradeStatus: Upgraded to precise on 2012-04-27 (325 days ago) dmi.bios.date: 08/09/2010 dmi.bios.vendor: Award Software International, Inc. dmi.bios.version: F9 dmi.board.name: GA-MA78LMT-US2H dmi.board.vendor: Gigabyte Technology Co., Ltd. dmi.board.version: x.x dmi.chassis.type: 3 dmi.chassis.vendor: Gigabyte Technology Co., Ltd. dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF9:bd08/09/2010:svnGigabyteTechnologyCo.,Ltd.:pnGA-MA78LMT-US2H:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-MA78LMT-US2H:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr: dmi.product.name: GA-MA78LMT-US2H dmi.sys.vendor: Gigabyte Technology Co., Ltd. version.compiz: compiz 1:0.9.7.12-0ubuntu1 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.39-0ubuntu0.1 version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.4-0ubuntu0.4 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.4-0ubuntu0.4 version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu10.12 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1.2 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 2:2.17.0-1ubuntu4.3 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1build3 ** Affects: xorg (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug crash precise running-unity ubuntu -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1156574 Title: User interface crashes, computer restarts back to login screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1156574/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs