> My T41p works fine using a dual-head xorg.conf (which, if I understand > this correctly, disables the experimental 3D acceleration) but freezes > immediately when using my "ordinary" xorg.conf. You can try "glxgears -printfps". If you have a working dri configuration you will have ~1200 fps. (without ~300 fps) I don't use dual-head, but I will use it in future ...