i found a temporary solution in ubuntuforums http://www.ubuntuforums.org/showthread.php?t=289763
I had to comment the modules glx, dri and the hole DRI section. Now i can use Openoffice without any problem. Attached is my xorg.conf working with an 1280x800 external monitor. ** Attachment added: "wonrking xorg.conf" http://librarian.launchpad.net/5065101/xorg.conf.ext -- Xorg Crashes every time on xorg dual-head configuration. https://launchpad.net/bugs/57770 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs