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** Attachment added: "LightdmDisplayLog.txt"
   https://bugs.launchpad.net/bugs/1497621/+attachment/4480485/+files/LightdmDisplayLog.txt

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https://bugs.launchpad.net/bugs/1497621

Title:
  Unity display corrupted on login or switch user

Status in xorg package in Ubuntu:
  Incomplete

Bug description:
  I have a new install of 15.04.  I am using lightdm with a unity
  desktop (default).  I have two users on my system.  Often when I log
  in or switch user unity or lightdm (I don't know enough to understand
  which one) will freeze on a corrupted display.  The launcher icons and
  the launcher will be overwritten with some pseudo-random pattern.  the
  bar across the top of the display will also be corrupted.  Sometimes
  the display has both my desktop and the unity-login greeter mixed.  I
  usually can't type or do alt-f2 for several seconds.  At some point
  (usually several seconds later) the display will appear to "reset,"
  sometimes once, sometimes several times and eventually will settle on
  an uncorrupted, usable screen.  If I switch user 10 times this will
  happen on 8 of them.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: lightdm 1.14.2-0ubuntu1
  ProcVersionSignature: Ubuntu 3.19.0-28.30-generic 3.19.8-ckt5
  Uname: Linux 3.19.0-28-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.17.2-0ubuntu1.3
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sat Sep 19 13:32:18 2015
  InstallationDate: Installed on 2015-09-07 (11 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  LightdmConfig:
   [SeatDefaults]
   user-session=ubuntu
   greater-session=unity-greeter
   allow-guest=false
  SourcePackage: lightdm
  UpgradeStatus: No upgrade log present (probably fresh install)
  --- 
  .proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: u'/proc/driver/nvidia/gpus/0'
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  304.125  Mon Dec  1 19:58:28 PST 2014
   GCC version:  gcc version 4.9.2 (Ubuntu 4.9.2-10ubuntu13)
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.17.2-0ubuntu1.5
  Architecture: amd64
  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
  DistUpgraded: Fresh install
  DistroCodename: vivid
  DistroRelease: Ubuntu 15.04
  DistroVariant: ubuntu
  DkmsStatus:
   bbswitch, 0.7, 3.19.0-28-generic, x86_64: installed
   nvidia-304-updates, 304.125, 3.19.0-28-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   NVIDIA Corporation NV42GL [Quadro FX 3450/4000 SDI] [10de:00cd] (rev a2) (prog-if 00 [VGA controller])
     Subsystem: NVIDIA Corporation Device [10de:029b]
  InstallationDate: Installed on 2015-09-07 (23 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: Dell Inc. Precision WorkStation T7400
  NonfreeKernelModules: nvidia
  Package: xorg 1:7.7+7ubuntu4
  PackageArchitecture: amd64
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-28-generic root=UUID=6b47b672-56ef-495b-91b2-473d05d45e15 ro quiet splash
  ProcVersionSignature: Ubuntu 3.19.0-28.30-generic 3.19.8-ckt5
  Tags:  vivid ubuntu compiz-0.9
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  Uname: Linux 3.19.0-28-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm lpadmin sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 08/21/2008
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A04
  dmi.board.name: 0RW199
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 7
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA04:bd08/21/2008:svnDellInc.:pnPrecisionWorkStationT7400:pvr:rvnDellInc.:rn0RW199:rvr:cvnDellInc.:ct7:cvr:
  dmi.product.name: Precision WorkStation T7400
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.12.1+15.04.20150410.1-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.60-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.5.9-2ubuntu1~vivid2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.5.9-2ubuntu1~vivid2
  version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.1-0ubuntu3.1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0-1ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917-1~exp1ubuntu2.2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2build1
  xserver.bootTime: Fri Sep 25 22:41:22 2015
  xserver.configfile: default
  xserver.errors: open /dev/fb0: No such file or directory
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   
  xserver.version: 2:1.17.1-0ubuntu3.1

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