Description of problem:

I am not sure with the component, please reassign if I am wrong.

I am using laptop (Lenovo T500) and external display. Usualy I have the lid closed and using external display only and therefore I have the screen mirroring on. Occasionally my system starts with dual display anyway, I can't see the login dialog in gdm since it is on the "closed" display and the external display shows only background. If I open the lid the mirroring is restored and can see the dialog also on the external display. 


Version-Release number of selected component (if applicable):
RHEL6.0-20100527.2
control-center-2.28.1-16.el6
xorg-x11-server-Xorg-1.7.7-2.el6

How reproducible:
Hard to reproduce, the bug appears in less then 5% of boots.

Steps to Reproduce:
1. plug external display to your laptop
2. configure screen mirroring in gnome-display-settings
3. start your system with the lid closed
  
Actual results:
Sometimes the dual display is on, login dialog is only on the "closed" display.

Expected results:
Displays are mirrored properly.