I had the same problem, I was able to fix it by using my xorg.conf from FC11 - 
you can generate one using system-config-display (by default FC11 and 12 do not 
use xorg.conf).  Here is mine:

# Xorg configuration created by system-config-display

Section "ServerLayout"
        Identifier     "single head configuration"
        Screen      0  "Screen0" 0 0
        InputDevice    "Keyboard0" "CoreKeyboard"
EndSection

Section "InputDevice"

# keyboard added by rhpxl
        Identifier  "Keyboard0"
        Driver      "kbd"
        Option      "XkbModel" "pc105+inet"
        Option      "XkbLayout" "us"
EndSection

Section "Monitor"
        Identifier   "Monitor0"
        ModelName    "Dell 2000FP (Digital)"
        HorizSync    31.5 - 80.0
        VertRefresh  56.0 - 76.0
        Option      "dpms"
EndSection

Section "Monitor"
        Identifier   "Monitor1"
        ModelName    "Dell 2000FP (Digital)"
        HorizSync    31.5 - 80.0
        VertRefresh  56.0 - 76.0
        Option      "dpms"
EndSection


Section "Device"
        Identifier  "Videocard0"
        Driver      "intel"
EndSection

Section "Screen"
        Identifier "Screen0"
        Device     "Videocard0"
        Monitor    "Monitor0"
        DefaultDepth     24
        SubSection "Display"
                Viewport   0 0
                Depth     24
                Modes    "1600x1200" "1280x800" "1024x768"
                Virtual 3200 2400
        EndSubSection
EndSection

-----Original Message-----
From: [email protected] 
[mailto:[email protected]] On Behalf Of William Henry
Sent: Friday, December 04, 2009 3:33 PM
To: fedora-laptop-list
Subject: F12 upgrade on lenova - desktop issues.

Hi,

I upgraded to F12 using the preupgrade over the internet option. I had done 
this with F11 with great success. 

Now that I can see the working desktop it is looking pretty much the same as my 
F11 setup.

However I have a problem when I reboot in my docking station with the external 
monitor and the laptop screen closed. F12 seems to continue to default to using 
the monitor as an extension rather than a mirror. Therefore in my docking 
station - neatly tucked in under my desk - I can't do any work. I've tried to 
undock and mess with the Desktop settings and force it to mirror (and apply and 
close) and then reinstall in my docking station and restarting. Still uses my 
monitor as an extension and my laptop is rendered useless. So I'm typing this 
with the laptop off my docking station.

Anyone have any ideas?

William

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