ibook G4 only external video

[Joerg Sommer <joerg@alea.gnuu.de>]

Hi,

how can I disable the internal video and only use the external video with
the ibook g4?

I tried setting the "Screen 1", but it doesn't work.

Section "Device"
        Identifier      "ATI External"
        Driver          "radeon"
        BusID           "PCI:0:16:0"
        Screen          1
        Option          "UseFBDev"      "false"
#       Option          "UsePWLData"
#       Option          "fbdev"         "/dev/fb/0"
        Option          "AGPMode"       "4"
        Option          "AGPFastWrite"  "off"
        Option          "DDCMode"       "off"
#       Option          "EnablePageFlip"
        Option          "BackBuffer"
        Option          "DRIReinit"
EndSection

I get the messages

(WW) RADEON: No matching Device section for instance (BusID PCI:0:16:0) found
(EE) Screen 0 deleted because of no matching config section.

Can anyone help me?

Thanks, Joerg.

-- 
"UNIX was not designed to stop people from doing stupid things, because
 that would also stop them from doing clever things."
         -- Doug Gwyn