Public bug reported:

display freeze to a striped brown colored screen after logging out.
This bug happens randomly, and sometimes it can be work around by switch 
through ttys (ctrl+alt+f1...f2...f...) and switch back to tty7, but sometimes 
it can't.

I've encountered this bug in fedora 16(using gdm) with no property
drivers(fglrx) installed, so it may be a X bug.

I'm ready to provide more information.

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: Mon May 14 17:07:29 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 
(20120425)
ProcEnviron:
 LANGUAGE=zh_CN:zh
 TERM=xterm
 PATH=(custom, no user)
 LANG=zh_CN.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/999038

Title:
  screen freeze after logging out

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