compiz and metacity fight to be "compositing manager" in debian lenny

After I managed to run my X fine after my last problem with Xorg configurations, I had apt-getted compiz fusion. After it has run few times ok, It just stopped running, when i try to start it using compiz --replace I get the following error:

/usr/bin/compiz.real (core) - Error: Could not acquire compositing manager selection on screen 0 display ":0.0"
/usr/bin/compiz.real (core) - Fatal: No manageable screens found on display :0.0

debian lenny, Xorg 7.3, and xorg.conf

I had problems after I installed debian lenny on my laptop, After some digging in the system I found that debian lenny now includes Xorg 7.3 , there's something that made me really lost regarding it, that it simply doesn't use the file /etc/X11/xorg.conf .. actually i didn't find it on my system. So - as I'm used to - issued the configuring command

dpkg-reconfigure xserver-xorg

and I was really surprised that the configurations was only for input devices (keyboard), and the generated xorg.conf was such a lame, contains only the following:

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