confirmed on a fulle updated Karmic .
Te display turns black, comes up again end the square with message appears in 
the notification area.
About the same time the folowing messages are logged in the xorglog:

disable LVDS
disable LVDS
enable LVDS

-- 
gnome-power-manager and blanking (removal of bodges)
https://bugs.launchpad.net/bugs/421347
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