I am having this problem too and I am running Natty 32bit on a desktop (Lenovo 
ThinkCentre 8810-AA5) with an Intel onboard graphics card (00:02.0 VGA 
compatible controller: Intel Corporation 82Q963/Q965 Integrated Graphics 
Controller (rev 02)).
The workaround that I am using is:
- switch to a console using Ctrl-Alt-F1.
- ps aux|grep gnome-screensaver to get the process ID
- kill -9 <pid> 
- switch back to the X

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

Title:
  Natty Screensaver freezes system after some period of inactivity

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