Ubuntu 10.04/10.10 set primary monitor problem

In Ubuntu 10.04/10.10

You can't set your primary monitor which you want

the primary monitor is always on left

So I find a script to solve this problem

form

http://www.thetechrepo.com/main-articles/502-how-to-change-the-primary-monitor-in-ubuntu-or-other-linux-distributions

monitor-switcher.sh:

#!/bin/bash
# Author: Andrew Martin
# Credit: http://ubuntuforums.org/showthread.php?t=1309247
echo "Enter the primary display from the following:"   # prompt for the display
xrandr --prop | grep "[^dis]connected" | cut --delimiter=" " -f1 # query connected monitors
 
read choice        # read the users's choice of monitor
 
xrandr --output $choice --primary     # set the primary monitor

chmod +x monitor-switcher.sh

./monitor-switcher.sh

Enter the primary display from the following:
DFP2
DFP3


and enter DFP2 or DFP3


if you success, you will see the primary monitor change