I think the cause of this bug was misunderstood by someone.
I also get hanging after screen goes blank in 11.04 (natty) but switching to 
VT1 and killing gnome-screensaver doesn't help (and I don't even think it's the 
cause).
Every time I notice this problem the last line of Xorg.0.log was like:
"[  1914.240] (II) AIGLX: Suspending AIGLX clients for VT switch".

Problem can be easily reproduced in my system: set 1 minute display timeout on 
Power Management and wait.
It doesn't hang every time screen goes black, but every time it hang, 
Xorg.0.log contains that message.
Maybe is more frequent if the browser is playing Flash content.


Chipset: Intel(R) GM45
Video card: Intel 4500MHD

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https://bugs.launchpad.net/bugs/762918

Title:
  Natty Screensaver freezes system after some period of inactivity

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