Tried looking for something like that but didn't find anything.
I also entered xconf before startx but I keep getting the same error!
I can run it in VESA mode or something like that though, chosen from the option menu before linux starts loading.
I got a Toshiba Pro P200 laptop.
I have the same Toshiba laptop, and the same problem...I have no idea, how to solve it, I've tried many of xorg config files.
Perhaps the ati.lzm will help us, before I try everything on an external monitor.