ThinkPad docking script (copied from http://www.thinkwiki.org/wiki/Docking_Solutions)

81-thinkpad-dock.rules

# save as /etc/udev/rules.d/81-thinkpad-dock.rules

KERNEL=="dock.0", ACTION=="change", RUN+="/usr/local/sbin/thinkpad-dock.sh"

thinkpad-dock.sh

#!/bin/sh -ex

# save as /usr/local/sbin/thinkpad-dock.sh

# wait for the dock state to change
sleep 0.5

DOCKED=$(cat /sys/devices/platform/dock.1/docked)

# invoke from XSetup with NO_KDM_REBOOT otherwise you'll end up in a KDM reboot loop
NO_KDM_REBOOT=0
for p in $*; do
case "$p" in
"NO_KDM_REBOOT")
NO_KDM_REBOOT=1
;;
"SWITCH_TO_LOCAL")
DOCKED=0
;;
esac
done

function switch_to_local {
export DISPLAY=$1
#export XAUTHORITY=$(find /var/run/kdm -name "A${DISPLAY}-*")

# Turn off all external displays
for output in $(/usr/bin/xrandr --verbose|grep "+"|grep connected| grep -v LVDS|awk '{print $1}'); do
echo $output
logger -t DOCKING "Switching off $DISPLAY"
/usr/bin/xrandr --output $output --off
done

# Turn on local display
logger -t DOCKING "Switching on LVDS1"
/usr/bin/xrandr --output LVDS1 --auto
}

function switch_to_external {
export DISPLAY=$1
#export XAUTHORITY=$(find /var/run/kdm -name "A${DISPLAY}-*")

# The Display port on the docking station is on HDMI2 - let's use it and turn off local display
logger -t UNDOCKING "Switching off LVDS1 and turning on HDMI2/3"

/usr/bin/xrandr --output HDMI2 --primary --auto --rotate left --right-of LVDS1 &&
/usr/bin/xrandr --output LVDS1 --off
/usr/bin/xrandr --output HDMI3 --auto --left-of HDMI2

#/usr/bin/xrandr --output HDMI3 --auto --left-of HDMI2
#/usr/bin/xrandr --output LVDS1 --off
#/usr/bin/xrandr --output HDMI2 --primary --auto --rotate left

#/usr/bin/xrandr --output HDMI3 --primary --right-of LVDS1
#/usr/bin/xrandr --output LVDS1 --off
#/usr/bin/xrandr --output HDMI2 --right-of HDMI3 --auto --rotate left

#/usr/bin/xrandr --output HDMI2 --primary --left-of LVDS1
#/usr/bin/xrandr --output HDMI3 --left-of HDMI2
#/usr/bin/xrandr --output LVDS1 --off
#/usr/bin/xrandr --output HDMI2 --primary --auto
}

case "$DOCKED" in
"0")
#undocked event
switch_to_local :0
;;
"1")
#docked event
switch_to_external :0
;;
esac