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[MarcelD <585685@xxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 573101 ***
    https://bugs.launchpad.net/bugs/573101

** Description changed:

+ [Copycat - A blackscreen can also appear due to a bug in the Gnome
+ screensaver. (goto bug #546578)]
+ 
  Steps to reproduce:
  1. While logged in as user A, System|Log Out <username>|Switch User
  2. Login to user B, ensure all is working properly and logout from user B.
  - screen goes black
  - keyboard no longer works
  - mouse no longer works
  
  100% reproduceable.
  
  However, I can:
  1. ssh -X into the machine w/o issue. I can bring up gui's from the affected machine (i.e., gnome-system-log, vino-preferences, etc).
  2. remote login to the machine via VNC and get a screen; however I then get multiple tserver instances & have to kill it. Remote login to the machine using NX w/o issue.
  3. reboot the machine from the remote ssh.
  
  Attempts to resolve:
  
  1. Ensured that the problem exists with enhanced graphics turned off (System|Preferences|Appearance|Visual Effects|None) 
  2. Ensured that the problem wasn't related to gnome-screensaver as per similar reports (purged gnome-screensaver, installed gnome-screensaver 2.30.0-0ubuntu2 etc).
  
  Workaround:
  Remove nvidia-96 and reboot. All switching between users then works properly. Reinstall nvidia-96 and the problem occurs.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: nvidia-96 96.43.17-0ubuntu1
  ProcVersionSignature: Ubuntu 2.6.32-22.33-generic 2.6.32.11+drm33.2
  Uname: Linux 2.6.32-22-generic i686
  NonfreeKernelModules: nvidia
  Architecture: i386
  Date: Tue May 25 19:53:36 2010
  DkmsStatus:
   vboxdrv, 3.2.0, 2.6.32-22-generic, i686: installed 
   vboxnetadp, 3.2.0, 2.6.32-22-generic, i686: installed 
   nvidia-96, 96.43.17, 2.6.32-21-generic, i686: installed 
   nvidia-96, 96.43.17, 2.6.32-22-generic, i686: installed 
   vboxnetflt, 3.2.0, 2.6.32-22-generic, i686: installed
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-22-generic root=UUID=c606c2a7-1fb1-403f-9b90-52f5f150340b ro quiet splash
  ProcEnviron:
   LANGUAGE=en_US:en
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: nvidia-graphics-drivers-96
  dmi.bios.date: 09/29/2004
  dmi.bios.vendor: Intel Corp.
  dmi.bios.version: BF86510A.86A.0069.P21.0409290100
  dmi.board.name: D865GBF
  dmi.board.vendor: Intel Corporation
  dmi.board.version: AAC25843-408
  dmi.chassis.type: 2
  dmi.modalias: dmi:bvnIntelCorp.:bvrBF86510A.86A.0069.P21.0409290100:bd09/29/2004:svn:pn:pvr:rvnIntelCorporation:rnD865GBF:rvrAAC25843-408:cvn:ct2:cvr:
  glxinfo: Error: [Errno 2] No such file or directory
  system:
   distro:             Ubuntu
   codename:           lucid
   architecture:       i686
   kernel:             2.6.32-22-generic

-- 
Logout after switch user causes black screen and disables keyboard and mouse
https://bugs.launchpad.net/bugs/585685
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