[SOLVED] Re: How do I get Performance Mode = "Desktop" in X Server Settings dialog?
ARRRRGGGGHH.. GNOME 3.
Put it into fallback mode (System Settings -> System Info -> Graphics -> Forced Fallback Mode -> ON) and the Performance Mode will behave as expected.
BTW This also solved a problem I was having with corrupted refresh/redraw of OpenMotif text widgets. (Most of my work involves using a Motif application... not through choice!) If fallback mode doesn't scrub up, I'll be consigning Gnome 3 to the history books...