When I run Debian, I cannot run any 3D programs (such as glxgears or bzflag). I know this is possible under pdaXrom, so I figure I'm just missing a package or I have a configuration problem.
Here is the error message if I try running glxgears:
Xlib: extension "GLX" missing on display "0:0.0".
glxgears: Error: couldn't get an RGB, Double-buffered visual.