So I tested also this blank screen problem with some mainline kernels.

Linux bilbo 3.0.9-030009-generic #201111111635 SMP Fri Nov 11 21:43:52 UTC 2011 
i686 i686 i386 GNU/Linux
Linux bilbo 3.1.0-030100rc10-generic #201110200610 SMP Thu Oct 20 10:20:00 UTC 
2011 i686 i686 i386 GNU/Linux
Linux bilbo 3.1.1-030101-generic #201111111651 SMP Fri Nov 11 22:00:08 UTC 2011 
i686 i686 i386 GNU/Linux

The Problem is only solved with kernel 
Linux bilbo 3.0.9-030009-generic #201111111635 SMP Fri Nov 11 21:43:52 UTC 2011 
i686 i686 i386 GNU/Linux

xset s activate works fine with this one. Moving the mouse or typing a
key brings the screen back.

Can I send something more to help?

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https://bugs.launchpad.net/bugs/872652

Title:
  screensaver backlight stuck off, system looks hung

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