Comment 29 for bug 292214

I see the same RANDR behaviour here, it works in single head mode but not in multi-head. Doing 'xdpyinfo |grep RANDR' shows the extension present in one case but not the other. I don't think this is anything to do with my patch though, we have an Ubuntu 8.04 machine here that behaves in exactly the same way.

As far as I can tell 3D acceleration works just fine in dual head mode. Previous versions of the driver used to only render the 3d on one of the two heads and if you moved a 3d window to the other head it went blank. This version runs glxgears fine for me at 115 FPS. I have Option "AccelMode" "EXA" in both of my "Device" sections but I don't know if this is necessary. It doesn't seem to be Compiz capable though, I get 'The Composite extension is not available', so no funky rippling water effects for this desktop.