Public bug reported:

Steps to reproduce:
 - Set lightdm with unity-greeter as the login screen and restart the system.
 - Log in to an account with the Ubuntu session type. Note that the background 
picture drawn by unity-greeter remains on the screen and the session eventually 
takes over. (The transition should be seamless).
 - Log out.
 - Log in again. Note that the screen is blank for around 1-2 seconds.

I have been able to reproduce this on a desktop with Radeon HD 6870
(radeon driver / Gallium 0.4 on AMD BARTS); as well as on a Dell XPS 13
with Intel HD 3000 graphics. I also experience the same symptoms logging
in to a GNOME Shell session.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: lightdm 1.3.3-0ubuntu3
ProcVersionSignature: Ubuntu 3.5.0-14.15-generic 3.5.3
Uname: Linux 3.5.0-14-generic x86_64
ApportVersion: 2.5.1-0ubuntu7
Architecture: amd64
Date: Sun Sep  9 15:21:08 2012
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110906)
SourcePackage: lightdm
UpgradeStatus: Upgraded to quantal on 2012-08-26 (14 days ago)

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


** Tags: amd64 apport-bug quantal third-party-packages

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https://bugs.launchpad.net/bugs/1048409

Title:
  Screen is blank when logging in, after logging in once before

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