LCD-CRT Cloning for Radeon Mobility 9200 (12" iBook G4)

I am trying to configure my iBook so that I can connect up to an
external monitor. Under Mac OS/X this works fine, but not under Gentoo.

I have tried using video=radeon and video=atyfb 

After much google searhcing I found a "m6mirror" command-line tool which
should switch the CRT on/off. This doesn't seem to help.

Whenever connecting to the external monitor there is just a white screen
on the external while the LCD remains fine.

I am not sure where to go from here to try get this working, but working
on a bigger monitor would be an advantage ;-)

Regards,
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