User interface crashes, computer restarts back to login screen

[Carsten Agger]

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

[Carsten Agger (agger)]

OK, I'm beginning to think this is because of faulty hardware. Not the proprietary graphics driver, as it's not loaded, but something else. The computer restarted at least eight times today before I gave up!

Still, if some hardware is faulty shouldn't the OS report this rather than reboot?

[penalvch (penalvch)]

Carsten Agger, this bug was reported a while ago and there hasn't been any activity in it recently. We were wondering if this is still an issue? If so, could you please test for this with the latest development release of Ubuntu? ISO images are available from http://cdimage.ubuntu.com/daily-live/current/ .

If it remains an issue, could you please run the following command in the development release from a Terminal (Applications->Accessories->Terminal), as it will automatically gather and attach updated debug information to this report:

apport-collect -p xorg-server REPLACE-WITH-BUG-NUMBER

Please note, given that the information from the prior release is already available, doing this on a release prior to the development one would not be helpful.

Thank you for your understanding.

Helpful bug reporting tips:
https://wiki.ubuntu.com/ReportingBugs

[Launchpad Janitor (janitor)]

[Expired for xorg-server (Ubuntu) because there has been no activity for 60 days.]