hi !
i think it is probably radeon module which i successfully installed but after some problems.. i remember that it failed on other modules but radeon seemed to go well... donno...
i agree, that i sounds like the problem is with your drivers. well, have you tried the "vesa" module ? it's very generic and works for my radeon on my notebook (though, of course, performance is not sufficient)
mfg.as.r IOhannes