Xserver boot problem: Mouse won't load

[Eric Youngson <eayoungs@mac.com>]

    I have a G4 400MHZ, AGP 2x with an ATI Rage 128 Pro.  I recently
installed Debian 2.2 Potato.  My default Xserver is FBDev.  When I
originally entered the command: startx, I got an error about the xserver not
being able to load the mouse.  I edited the file:
/usr/X11R6/lib/X11/XF86Config.
Under pointer device I specified: "USB" for protocol and "usbmouse" for the
device.  I checked /dev and found "usbmouse", so I know it exists.  The
problem is that now I get this message:

    Config Error: /usr/X11R6/lib/X11/XF86Config:217
        protocol "USB"
    Mouse type not supported by this OS

I don't believe this message, because of course the keyboard is USB and it
works fine.  I even got this configuration to boot the xserver with another
protocol specified, but the mouse doesn't respond and I have to force it to
quit.  If anyone has any suggestions at all, I would greatly appreciate
them.  Thanks in advance
-- 
    Eric