Integrated Intel 950 on my T60, which is supported out of the box on any Linux distro (drivers in Kernel). Good enough for FlightGear(Not bad at all), Tremulous(A++ Game BTW), OpenArena (Good quickie FPS)and yours truly TuxRacer :laughing;
Heck it even runs Microsoft Flight Simulator 2004 & Unreal Tournament 2003 almost at max settings on Windows

which is not bad because I had no intention for gaming when I got this laptop a year and a half back, but when ever my index finger itches you know
BTW, what drivers and what ATI Chipset are you using? There are some drivers out there that can get you some decent 3D