Hmm..I suspect that SIS does not support OpenGL under Linux. I found this:
Q: Tuxracer is terribly slow on my SiS 315/550/650/651/330/661/741/760/761/340/XGI Vx
A: DRI and hardware accelerated OpenGL/3D is not supported on these chipsets.
Don't know if that will help or not or whether it's a)true anymore or b)valid for your chipset.
Have you tried any other OpenGL applications?
Q: Tuxracer is terribly slow on my SiS 315/550/650/651/330/661/741/760/761/340/XGI Vx
A: DRI and hardware accelerated OpenGL/3D is not supported on these chipsets.
Don't know if that will help or not or whether it's a)true anymore or b)valid for your chipset.
Have you tried any other OpenGL applications?