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 Desktop
Packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1156574

Title:
  User interface crashes, computer restarts back to login screen

Status in “xorg” package in Ubuntu:
  New

Bug description:
  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

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