A default install of Testing on a G3 12" iBook generated similar issues.
1. An xorg.conf is required. Otherwise, the ibook locks up.
2. The xorg.conf needs a disable glx stanze. I can enable dri and dri2. Enable glx and the ibook is not recoverable without a power switch shutdown.
3. driconf reports that the video card is not DRI capable. (Maybe because there's no GLX???)
Desktop is painfully slow without acceleration.