Ubuntu 9.10 Upstart Script to switch xorg.conf on Dell D620/D630 based on docking status. Place in /etc/init/ as gdmswitch.conf and add this line to gdm.conf: "and started gdmswitch"

gistfile1.sh

description     "xorg.conf switch"

start on (filesystem
          and runlevel [2345]
          and started hal
          and stopped udevtrigger)
stop on runlevel [016]

emits gdmswitch

script
        if [ lshal -u platform_dock_0 | grep 'info.docked' | awk '{print $3}'` = true ]; then
        	ln -fs /etc/X11/xorg.conf.work /etc/X11/xorg.conf
	else
        	ln -fs /etc/X11/xorg.conf.home /etc/X11/xorg.conf
	fi;
end script