Description of problem:

I have just updated to latest RHEL6.2 compose from RHEL6.1 and now I am facing following issue.
I am using docking station for my T500 with external display. My notebook is closed all the time, I am using just external display. Display configuration is set to "mirror" in Display config dialog. 

During the system start up all messages are printed on my external display (this is fine) but when gdm/xserver starts, is switches do dualhead and my primary display (with login dialog) is the closed (notebook) one. On my external display I can see just the background.

When I open the lid and login to gnome display switches to mirror mode as configured and everything is fine. Till the next reboot.

This forces me to open my netbook lid just because of login.

Version-Release number of selected component (if applicable):
$ rpm -qa | grep xorg
xorg-x11-xauth-1.0.2-7.1.el6.x86_64
xorg-x11-proto-devel-7.6-12.el6.noarch
xorg-x11-drv-vesa-2.3.0-2.el6.x86_64
xorg-x11-drv-nouveau-0.0.16-13.20110719gitde9d1ba.el6.x86_64
xorg-x11-drv-vmware-11.0.3-1.el6.x86_64
xorg-x11-drv-dummy-0.3.4-1.el6.x86_64
xorg-x11-drv-i128-1.3.4-1.el6.x86_64
xorg-x11-drv-ast-0.91.10-1.el6.x86_64
xorg-x11-drv-aiptek-1.4.1-2.el6.x86_64
xorg-x11-drivers-7.3-13.3.el6.x86_64
xorg-x11-drv-vmmouse-12.7.0-1.el6.x86_64
xorg-x11-server-common-1.10.4-1.el6.x86_64
xorg-x11-drv-ati-6.14.2-6.el6.x86_64
xorg-x11-drv-sis-0.10.3-1.el6.x86_64
xorg-x11-drv-nv-2.1.18-2.el6.x86_64
xorg-x11-font-utils-7.2-11.el6.x86_64
xorg-x11-drv-mach64-6.9.0-1.el6.x86_64
xorg-x11-drv-cirrus-1.3.2-2.el6.x86_64
xorg-x11-xinit-1.0.9-13.el6.x86_64
xorg-x11-drv-evdev-2.6.0-2.el6.x86_64
xorg-x11-utils-7.4-8.el6.x86_64
xorg-x11-drv-siliconmotion-1.7.5-1.el6.x86_64
xorg-x11-drv-intel-2.16.0-1.el6.x86_64
xorg-x11-drv-glint-1.2.5-1.el6.x86_64
xorg-x11-drv-rendition-4.2.4-1.el6.x86_64
xorg-x11-drv-synaptics-1.4.1-3.el6.x86_64
xorg-x11-fonts-misc-7.2-9.1.el6.noarch
xorg-x11-drv-ati-firmware-6.14.2-6.el6.noarch
xorg-x11-drv-elographics-1.3.0-2.el6.x86_64
xorg-x11-drv-hyperpen-1.4.1-2.el6.x86_64
xorg-x11-drv-r128-6.8.1-3.el6.x86_64
xorg-x11-drv-qxl-0.0.14-6.el6.x86_64
xorg-x11-drv-s3virge-1.10.4-2.el6.x86_64
xorg-x11-xkb-utils-7.4-6.el6.x86_64
xorg-x11-server-Xephyr-1.10.4-1.el6.x86_64
xorg-x11-drv-xgi-1.6.0-10.el6.x86_64
xorg-x11-drv-sisusb-0.9.4-1.el6.x86_64
xorg-x11-drv-tdfx-1.4.3-2.el6.x86_64
xorg-x11-drv-voodoo-1.2.4-1.el6.x86_64
xorg-x11-drv-openchrome-0.2.904-4.el6.x86_64
xorg-x11-server-utils-7.5-5.1.el6.x86_64
xorg-x11-drv-mutouch-1.3.0-2.el6.x86_64
xorg-x11-drv-mouse-1.7.0-4.el6.x86_64
xorg-x11-drv-i740-1.3.2-2.el6.x86_64
xorg-x11-drv-wacom-0.10.5-13.el6.x86_64
xorg-x11-drv-savage-2.3.2-1.el6.x86_64
xorg-x11-drv-keyboard-1.6.0-1.el6.x86_64
xorg-x11-drv-void-1.4.0-1.el6.x86_64
xorg-x11-drv-v4l-0.2.0-4.el6.x86_64
xorg-x11-drv-penmount-1.5.0-2.el6.x86_64
xorg-x11-drv-apm-1.2.3-2.el6.x86_64
xorg-x11-server-Xorg-1.10.4-1.el6.x86_64
xorg-x11-drv-fpit-1.4.0-2.el6.x86_64
xorg-x11-drv-fbdev-0.4.2-2.el6.x86_64
xorg-x11-drv-trident-1.3.4-1.el6.x86_64
xorg-x11-drv-acecad-1.5.0-3.el6.x86_64
xorg-x11-drv-mga-1.4.13-2.el6.x86_64


How reproducible:
always for me

Steps to Reproduce:
1. closed notebook in docking station with external display connected
2. start the system
3. gdm login dialog doesn't appear on external display
  
Expected results:
login dialog on external display

Additional info:
please, let me know what logs do you need.