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[MarcelD <573101@xxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 546578 ***
    https://bugs.launchpad.net/bugs/546578

** Description changed:

- [Copycat - A blackscreen can also appear due to a bug in the Gnome
- screensaver. (goto bug #546578)]
+ [Copycat - A blackscreen can also appear due to a bug in the ATI driver
+ - workaround involving gnome-screensaver. (goto bug #546578)]
  
  Binary package hint: nvidia-graphics-drivers
  
  Steps to reproduce:
  1. While logged in as user A, System | Switch User
- 2. Login to user B (Xterm or Gnome session), ensure all is working 
-     properly and logout from user B.
-    - screen goes black
-    - keyboard no longer works
-    - mouse no longer works
-    - remote SSH shows GDM does not start GDM - LoginWindow 
-      session on the active TTY, as it normally does after logging 
-      out with only one user on the system. TTY does not respond to
-      input.
+ 2. Login to user B (Xterm or Gnome session), ensure all is working
+     properly and logout from user B.
+    - screen goes black
+    - keyboard no longer works
+    - mouse no longer works
+    - remote SSH shows GDM does not start GDM - LoginWindow
+      session on the active TTY, as it normally does after logging
+      out with only one user on the system. TTY does not respond to
+      input.
  
  Patch:
-   Install latest NVidia graphics drivers.
+   Install latest NVidia graphics drivers.
  
  Hello!
  
  I have installed Ubuntu 10.04 LTS Desktop (lucid) from scratch.
  Then I've made 2 users. Then I login as one user and switch to the second user using gnome menu (not gdm). (New feature in lucid).
  When I do "Log Out" from the second user - video signal disappears and I'm not able to use neither X nor tty to do something with the system.
  I have Nvidia driver (version 173.14.22) turned on. When I turn it off and do the steps described above - video signal remains, but when I return to the screen of the first user - the brightness of the screen goes very low. (Fade bug in Gnome?) And sometimes I even get black screen with lonely mouse. (The screen is not unfaded).
  
  Maybe there are two different bugs? With nvidia driver (when screen is
  reset). And with gnome unfading when unlocking the screen.
  
  Best regards, Vladimir
  
  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: xorg 1:7.5+5ubuntu1
  ProcVersionSignature: Ubuntu 2.6.32-21.32-generic 2.6.32.11+drm33.2
  Uname: Linux 2.6.32-21-generic i686
  NonfreeKernelModules: nvidia
  Architecture: i386
  Date: Sat May  1 23:41:01 2010
  DkmsStatus: nvidia-173, 173.14.22, 2.6.32-21-generic, i686: installed
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
  Lsusb:
-  Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
-  Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
-  Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
-  Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
-  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
+  Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
+  Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
+  Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
+  Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
+  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-21-generic root=UUID=2f23dced-c74c-4966-af43-78805eab1070 ro quiet splash
  ProcEnviron:
-  LANG=ru_RU.utf8
-  SHELL=/bin/bash
+  LANG=ru_RU.utf8
+  SHELL=/bin/bash
  SourcePackage: xorg
  Symptom: display
  Title: Xorg freeze
  dmi.bios.date: 01/22/2004
  dmi.bios.vendor: Intel Corp.
  dmi.bios.version: RL86510A.86A.0071.P13.0401221036
  dmi.board.name: D865PERL
  dmi.board.vendor: Intel Corporation
  dmi.board.version: AAC27648-209
  dmi.chassis.type: 2
  dmi.modalias: dmi:bvnIntelCorp.:bvrRL86510A.86A.0071.P13.0401221036:bd01/22/2004:svn:pn:pvr:rvnIntelCorporation:rnD865PERL:rvrAAC27648-209:cvn:ct2:cvr:
  glxinfo: Error: [Errno 2] Нет такого файла или каталога
  system:
-  distro:             Ubuntu
-  codename:           lucid
-  architecture:       i686
-  kernel:             2.6.32-21-generic
+  distro:             Ubuntu
+  codename:           lucid
+  architecture:       i686
+  kernel:             2.6.32-21-generic

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https://bugs.launchpad.net/bugs/573101

Title:
  No video signal after "Log out" in gnome when multiple users