I didn't really understand what this fix does. I thought that with this fix changing the driver from "ati" to "fglrx" was enough to disable composite. in my case I remove from xorg.conf the lines to disable composite, but the fix does nothing: composite is still enabled
(II) fglrx(0): Composite extension enabled, disabling direct rendering -- disable composite in fglrx https://launchpad.net/bugs/90688 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs