Comment 5 for bug 150628

Invaliding the compiz bug; this has nothing to do with compiz.

I, too, am not surprised that you're the first to try this. I've only ever done X-over-SSH or used a more network-friendly protocol setup such as xvnc, both of which work. Also, there's still an underlying :0 X server which will be respecting the gdmsetup options.

Also note that Xgl is not a window manager, it's an X server :).