Found a solution for myself using the following script in 
/etc/X11/Xsession.d/45custom_xrandr_settings:
Code:
EXTERNAL_OUTPUT="VGA1"
INTERNAL_OUTPUT="LVDS1"

xrandr |grep $EXTERNAL_OUTPUT | grep " connected "
if [ $? -eq 0 ]; then
    xrandr --output $INTERNAL_OUTPUT --off --output $EXTERNAL_OUTPUT --auto 
else
    xrandr --output $INTERNAL_OUTPUT --auto --output $EXTERNAL_OUTPUT --off
fi
What the script does is disable my LVDS display when I connect the external 
monitor. 
I think the default behavior for gnome-display-properties should be to save the 
last config. It worked like that in Jaunty.  Now xrandr turns on all available 
displays whenever it runs (when you lock the screen/logoff/run the 
gnome-display-properties applet).

-- 
display configuration isn't saved
https://bugs.launchpad.net/bugs/566683
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