Weird X display

[Alain Didierjean]

Since I tried to swich to a frame buffered graphical display, following all 
steps described in the Framebuffer and Radeon pages of the gentoo wiki, all I 
get is a display of vertical colored stripes, the pointer appearing as a 
square. 
Knowned problem ? where should I look in the arcane config of FB, X and radeon 
(my graphic card is an ATI 3600)? I'm desperate.