Full session (rather then nested) Xgl now is working for me with the free ati driver, using the following script from GDM ...
#!/bin/bash # Start up Xgl, compiz, and GNOME # Run Xgl server on :1, on top of normal X Xgl :1 -fullscreen -ac -accel xv -accel glx:pbuffer & # Tell subsequent X programs to access the Xgl server at :1 DISPLAY=:1 # Start Compiz window manager gnome-window-decorator & compiz gconf decoration wobbly fade minimize cube rotate zoom scale move resize place menu switcher & # Start GNOME exec gnome-session :-) -- nested Xgl crash, ATI r300 https://launchpad.net/bugs/39759 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs