Dual screen with new ATI driver

[regisr]

Hello,

With the old driver I can have independant screens with a dual output
card or additional cards.
I used this to
- use :0.0 for desktop (window manager -windowmaker- , native
1280x1024)
- use :0.1 to display picture in full screen mode with a video
projector (native 1024 x 768)
With gqview I could select the second screen to display in full screen. 

How to do this with the new ati driver? It seems to not support this
mode. 
(  http://wiki.debian.org/XStrikeForce/HowToRandR12
See VI.5. No more multiple independent desktop )

Could you help me? 

My old conf: http://www.regix.com/X-xorg-et-radeon-9250.html
-- 
regis