Which driver are you using? The new legacy driver from the Ubuntu repositories doesn't support Composite, so you can't enable desktop- effects. There is another legacy driver from the nvidia website which supports it, though.
-- compiz start whitout decoration https://launchpad.net/bugs/97298 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
