Ok, guess. here is where wishes comes true from now on for ati radeon cards.
The kernel all of you are running maybe not supporting 3d acceleration. However the driver from ati does SUPPORT 3D ACCELERATION!!!!!!!!!!!
i don't know which bad site which says that. But ati didn't say they don't support 3d support! It's up to which dist. of linux you are using!
I am using redhat linux 9.0 and got no problem getting my asus a7n8x deluxe mb & 3d agp working!
HERE is the INSTALLATION GUIDE
You might not be a newbie regarding the using of linux. But you might be horrible at dealing stuff with X etc...
so, here is the solution for all of you!
1) if you are using any kernel that comes with the order dist. like mine red hat linux 9.0. I have to recompile my 2.4.* series kernel to get my card working! Which is a problem with kernel-2.4.20-8
2) make sure your kernel 's "DRI Support" WASN"T CHECK!!! That thing will mess up the whole thing of getting play game on your linux box.
3) make sure your kernel was compile with the support for both your motherboard and your video card!
4) Always compile as M or modules for support of your video card and * , buildin for your motherboard!
Here is a thread which i think will help ya the most
Also, for which driver was the best. all of them are ok either from ati.com or http://www.schneider-digital.de/html/download_ati.html
THe neofire driver i think will get ya to 3d right after your install and configured it. but i don't like it because i can't play my tux racer when i was using that driver.
so, up to yourself.
Good luck to ya!