Could you please define what is a "black screen" ?
I experience this bug, but sometimes, the screen of my laptop (a Dell XPS m1330 
with nvidia graphics) does not wakes up ! It just black AND switched off, while 
the hard drive, wifi and bluetooth LEDs are blinking (as usual). Trying to 
switch VTs doesn't do anyting, but typing my password makes me ear the ubuntu 
welcome sound.
Sometimes, I only get a black AND switched on screen (but it's blank).

Are these two different issues ?

-- 
Suspend/resume with nvidia driver fails
https://bugs.launchpad.net/bugs/488720
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