multiple monitors - Ubuntu 10.04 - Problem creating Xorg.conf for DualView

so far I found out that I need to configure the Xorg.conf to have DualView on my monitor. At this moment the screen is just duplicated. My Graphics Card is Matrox G550.

When trying

jannis@Ariel:/$ sudo Xorg -configure

Fatal server error: Server is already active for display 0 If this

server is no longer running, remove /tmp/.X0-lock and start again.

Please consult the The X.Org Foundation support at
http://wiki.x.org for help.

ddxSigGiveUp: Closing log

Also /etc/X11/xorg.conf doesn't exist..

Since I allready tried it a several months ago, lost my X configuration and needed to reinstall the OS I am terrified it can happen again.

Does anyone know what to do? Is there anyway to store the current/running configuration and restore it afterwards?

You have to stop xserver first. The procedure goes something like this:

1. Switch to tty1 by pressing ctrl-alt-f1




2. Become root: sudo -i.




3. Stop xserver: service gdm stop.





4. Run Xorg -configure.

A config file will be written into /root/xorg.conf.new. Copy that to the proper location.

1. Copying: cp /root/xorg.conf.new /etc/X11/xorg.conf




2. Restart xserver: service gdm start




3. Exit from root: exit




4. Return to tty7: ctrl-alt-f7.