Description of problem:

I am using Thinkpad T410 for dual screen extend setup with repo: RHEL6.2-20111005.1 .
After power on, the external moditor got black screen but xrandr show it have already set it up with correct resolution.

Screen only goes back if unplug and plug again the VGA cable or these commands:
====
if [ $? -eq 0 ]; then
    xrandr --output VGA1 --off
    xrandr --output VGA1 --auto
    xrandr --output LVDS1 --auto --left-of VGA1
====

Version-Release number of selected component (if applicable):
RHEL6.2-20111005.1

kernel-2.6.32-206.el6.x86_64
xorg-x11-xauth-1.0.2-7.1.el6.x86_64
xorg-x11-server-Xorg-1.10.4-3.el6.x86_64
xorg-x11-drv-intel-2.16.0-1.el6.x86_64
xorg-x11-utils-7.4-8.el6.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Connect a external screen via VGA of T410
2. Power on

Actual results:
external monitor got no display

Expected results:
external monitor got correctly display

Additional info:
If screen is online, reboot OS will not got any problem.

I try with and without xorg.conf, they are the same issue.
Here is the xorg.conf
==========
Section "Monitor"
        Identifier   "laptop"
EndSection
Section "Monitor"
        Identifier   "VGA"
    Option "PreferredMode"  "1680x1050"
    VertRefresh 60
    Option "RightOf"  "laptop"
#    Option "Ignore"   "true"
EndSection

Section "Device"
        Identifier  "Intel Core 5"
        Driver      "intel"
        BusID       "PCI:0:2:0"
    Option      "monitor-VGA1" "VGA"
    Option      "monitor-LVDS1" "laptop"
EndSection

Section "Screen"
        Identifier "Screen0"
        Device     "Intel Core 5"
        Monitor    "laptop"
    DefaultDepth  24
        SubSection "Display"
                Depth     24
        EndSubSection
EndSection
==========