External Screen on iBook2

[jgre@tzi.de (Janico Greifenberg)]

Hi,
I got Linux running on my iBook2 with Debian Woody but I got a problem with
plugging in an external Monitor. When I start the computer with screen
connected I see the picture on both the internal display and the external
screen, but as soon as Linux is loaded only the internal device is active. I
think that this might have to do with the framebuffer device, which I'm also
using for X11. 
Can anyone help me?

Thanks in advance 
       Janico
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