SiS cards

could you please make sis cards compatable because i have a sis 620 and opengl wont detect it.

If it already is please tell me

It’s up to the manufacturer of your card/chip to support OpenGL. Ask them instead.

The sis cards IMHO don’t support OpenGL, only D3D… and even that pretty crappy
I have the sis 620 onboard and it pretty much sucks as far as quality and performance are concerned (shared memory, no fillrate worth mentioning, etc.).
My suggestion: get a graphics card

There was a try of writing a GLX SiS opengl driver for XFree86 3.* under Linux.
Once I managed to run QuakeIII, that was quite ugly (1 or 2 years ago) : there were’nt really any texture, there were all mixed up.

But I repeat this was 1 or 2 years ago.

Advice: try it then buy a new card.
You may not have an AGP port on your motherboard, as the Sis620 is build onboard. So you may purchase a PCI card like a TNT2 or a GeForce 2MX.