Comment 100 for bug 546578

I am exeriencing the same issue - with the exception that both the keyboard and mouse go dead as well. If there is another bug report the more closely matches my symptions, please advise.

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.
3. reboot the machine from the remote ssh.

Attempted to use 'apport-collect 546578' to supply additional info, but response was that I wasn't a subscriber to this bug (I am) and the report was a duplicate (it isn't). So I'll manually add the bits that may be relevant:

2.6.32-22-generic #33-Ubuntu SMP Wed Apr 28 13:27:30 UTC 2010 i686 GNU/Linux

$ apt-cache policy gnome-screensaver
gnome-screensaver:
  Installed: 2.30.0-0ubuntu2
  Candidate: 2.30.0-0ubuntu2
  Version table:
 *** 2.30.0-0ubuntu2 0
        500 http://us.archive.ubuntu.com/ubuntu/ lucid-proposed/main Packages
        100 /var/lib/dpkg/status
     2.30.0-0ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ lucid/main Packages
$ apt-cache policy xorg
xorg:
  Installed: 1:7.5+5ubuntu1
  Candidate: 1:7.5+5ubuntu1
  Version table:
 *** 1:7.5+5ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ lucid/main Packages
        100 /var/lib/dpkg/status
$ apt-cache policy xserver-xorg-core
xserver-xorg-core:
  Installed: 2:1.7.6-2ubuntu7
  Candidate: 2:1.7.6-2ubuntu7
  Version table:
 *** 2:1.7.6-2ubuntu7 0
        500 http://us.archive.ubuntu.com/ubuntu/ lucid/main Packages
        100 /var/lib/dpkg/status
$ apt-cache policy nvidia-96
nvidia-96:
  Installed: 96.43.17-0ubuntu1
  Candidate: 96.43.17-0ubuntu1
  Version table:
 *** 96.43.17-0ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ lucid/restricted Packages
        100 /var/lib/dpkg/status

*-display
                description: VGA compatible controller
                product: NV25GL [Quadro4 900 XGL]
                vendor: nVidia Corporation

Note that there is no ATI in this machine. Given that I can reproduce & can get into the machine to gather information, please let me know if I can provide any added logs etc.