xserver trouble

[Giorgio Raccanelli <giorgio.raccanelli@videotec.com>]

Hello list

I'm in trouble with the installation of the xserver. After I installed 
the packages discover, mdetect and read-edit, I installed the 
x-window-system and configured it. When I run startx I get the following:

(WW) Radeon: No matching Device section for instance (BusID PCI:1:0:1) found
(EE) No device detected

why doesn't it detect the device?
Thanks in advance

Giorgio Raccanelli