Public bug reported:

This is turning to happen quite a lot lately, every time I login to and
say click on Firefox, after say a few minutes browsing, Firefox freezes
then the system crashes and throws me back to login screen.. If I log in
again it does the same. Have to shut off computer and unplug leaving it
for a few minutes before switching it back on with fingers crossed that
it wont crash immediately.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8.1
ProcVersionSignature: Ubuntu 3.16.0-36.48~14.04.1-generic 3.16.7-ckt9
Uname: Linux 3.16.0-36-generic i686
NonfreeKernelModules: nvidia
.proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86 Kernel Module  304.125  Mon Dec  1 19:55:52 PST 
2014
 GCC version:  gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1)
.tmp.unity.support.test.0:
 
ApportVersion: 2.14.1-0ubuntu3.10
Architecture: i386
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Tue May  5 09:49:35 2015
DistUpgraded: Fresh install
DistroCodename: trusty
DistroVariant: ubuntu
DkmsStatus:
 nvidia-304, 304.125, 3.16.0-31-generic, i686: installed
 nvidia-304, 304.125, 3.16.0-33-generic, i686: installed
 nvidia-304, 304.125, 3.16.0-34-generic, i686: installed
 nvidia-304, 304.125, 3.16.0-36-generic, i686: installed
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 NVIDIA Corporation G71 [GeForce 7900 GS] [10de:0292] (rev a1) (prog-if 00 [VGA 
controller])
   Subsystem: NVIDIA Corporation Device [10de:0370]
InstallationDate: Installed on 2015-03-17 (48 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release i386 (20150218.1)
MachineType: Dell Inc. Dell DXP051
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-36-generic 
root=UUID=0c61d87e-ac8a-4b5a-9506-502e4287158b ro quiet splash
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/08/2007
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A07
dmi.board.name: 0FJ030
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 7
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvrA07:bd01/08/2007:svnDellInc.:pnDellDXP051:pvr:rvnDellInc.:rn0FJ030:rvr:cvnDellInc.:ct7:cvr:
dmi.product.name: Dell DXP051
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.11.3+14.04.20150122-0ubuntu1
version.libdrm2: libdrm2 2.4.56-1~ubuntu2
version.libgl1-mesa-dri: libgl1-mesa-dri N/A
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg-core: xserver-xorg-core N/A
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
xserver.bootTime: Tue May  5 09:30:35 2015
xserver.configfile: default
xserver.devices:
 input        Power Button         KEYBOARD, id 6
 input        Power Button         KEYBOARD, id 7
 input        PixArt USB Optical Mouse MOUSE, id 8
 input        DELL DELL USB Keyboard KEYBOARD, id 9
xserver.errors: open /dev/fb0: No such file or directory
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 
xserver.version: 2:1.16.0-1ubuntu1.2~trusty2

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug compiz-0.9 i386 trusty ubuntu

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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1451723

Title:
   Ubuntu 14.04 crush to login screen

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