I am running Ubuntu 10.10 with a Intel 945GME Express Integrated Graphics Controller (rev 03) and I cannot use Visual Effects when I have both monitors turned on.
When I use the Visual Effects control to change it back to Normal or Extra the screens flicker and the checkbox stays on what I selected, but it doesn't actually activate, and when I re-open the dialog, it's back on None.
Is it just that my video card can't handle it, or is there a bug here that needs fixing?