This happens to me too.  I've written up a short script to work around this 
bug.  The script behavior isn't ideal (you have to run it again to turn the 
screen back on), but maybe some of you might find it helpful until this bug 
gets fixed:
http://alexcabal.com/turn-your-laptop-screen-off-with-a-keyboard-shortcut-in-ubuntu-karmic/

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Karmic Beta: Laptop only remains DPMS off for 2 seconds
https://bugs.launchpad.net/bugs/447728
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