Public bug reported:

When switching users on 12.04 it will sometimes just go to a black
screen with a cursor. The user switching to is not logged in yet.

Expected behavior: 
Click current user up top> from the drop-down click the user wanting to log in 
> brought to the lightdm log in screen and log that user in

Instead:
Click current user up top> from the dropdown click the user wanting to log in > 
brought to a black screen with a blinking cursor

>From here, you cannot type or initiate any keyboard shortcuts other than
Ctrl +Alt+F(1-6) to reach tty1 etc, or Ctrl+Alt+F7 to return to the user
that you were originally trying to switch from. Ctrl+Alt+F8 will bring
you back to the black screen.

This happens pretty often so I should be able to test anything needed.
Thanks!

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: lightdm 1.2.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
Uname: Linux 3.2.0-24-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
Date: Fri May 18 08:00:55 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 
(20120425)
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug precise

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https://bugs.launchpad.net/bugs/1001221

Title:
  12.04 black screen with blinking cursor when switching users

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