Comment # 18 on bug 71789 from Dan DeVoto

Same here.  Glxinfo says r300 fails to load.

dan@powerbook2:~$ glxinfo
name of display: :0.0
libGL error: No matching fbConfigs or visuals found
libGL error: failed to load driver: r300
libGL error: No matching fbConfigs or visuals found
libGL error: failed to load driver: swrast
Error: couldn't find RGB GLX visual or fbconfig

...