I have an ATI Raden dual head at my desktop here at my job. I like to use WindowMaker as my window manager of choice, but since I had upgraded to Ubuntu 10.04 Lucid, WindowMaker is showing some issues regarding the dual monitor setup. WindowMaker follows the login screen (GDM) monitor setup and when I launch a gnome-session, things get messed up. The first solution which came to my mind is to make gdm aware of the two monitors. "Googling" around I've found two usefull links: https://help.ubuntu.com/community/MultiseatOneCard http://ubuntuforums.org/showthread.php?t=1611704 Following the first section of the first link ("Extended desktop through both monitors") I've wrote my new xorg.conf file: Section "Monitor" Identifier "monitor0" EndSection Section "Monitor" Identifier "monitor1" Option "RightOf" "monitor0" EndSection Section "Device" Identifier "card0...