This doesn't seem to happen on a freshly install Ubuntu (the same 9.04 version, 
but installed instead of upgraded) which was install with the 2nd screen 
alreayd plugged.
The fact that Ubuntu was installed with the other screen already plugged may be 
the thing that prevents the bug to happen. I think it it because the external 
screen was first considered as the main screen, thus the vertical resolution 
being 1024 on the "main" screen, the "second" screen (the one integrated in the 
laptop)has no black area beacause it's reolution is less than 1024 (900).
Now I used my laptop a few times without the external screen , and the internal 
screen seem to be considered as the main screen (the one on which the login 
screen is displayed). The bug hasn't returned.

But of course, the bug is still happening if I run the "old" ubuntu
install, which is still on my HDD.

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black area on dual screen with compiz
https://bugs.launchpad.net/bugs/374748
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