I got the same hardware,too and the same problems. After Update to edgy eft -X-Server crashes when using dual screen configuration starting either an X-session in xfce4 or OpenOffice. Turning of the second display solves the problem.
-- 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
