@Bryce: It definitely is a packaging problem. Using the packages from Michael Marley's PPA (see comments #7-#9 above) I get the 3D SDL games working again.
At no point did compiz stop working, so OpenGL is definitely enabled in X11 and running smoothly as usual.
I don't know about the problem being driver-specific, since I'm only testing Jaunty on a laptop with an Intel 945GM (my desktop with an ATI card runs Intrepid), but other people should be able to confirm whether this is the case.
@Bryce: It definitely is a packaging problem. Using the packages from Michael Marley's PPA (see comments #7-#9 above) I get the 3D SDL games working again.
At no point did compiz stop working, so OpenGL is definitely enabled in X11 and running smoothly as usual.
I don't know about the problem being driver-specific, since I'm only testing Jaunty on a laptop with an Intel 945GM (my desktop with an ATI card runs Intrepid), but other people should be able to confirm whether this is the case.