Comment 5 for bug 137745

I get the same issue with a Radeon 7500 Mobility. Interestingly though, I
still get EXA acceleration and such for both X servers, even if no 3D
acceleration is available for the second X server. I believe the proprietary
NVidia drivers can 3D accelerate 2+ X servers, although I don't have access to
any NVidia hardware at the moment, so I can't check for sure, but it should be
possible for Radeons too.