This is certainly related to this bug:

https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-
intel/+bug/145501

As it didn't occur in Feisty on my Toshiba Portege R200 (i810 driver)
and apparently came in with Gutsy. I have these problems with Hardy
(intel driver). If I press Fn-F5 enough times it works, but doesn't
switch off the laptop screen any more. The toshset util switches
correctly, but again doesn't switch off the laptop screen - just dims
it.

I think it must be due to some kind of switch towards multiple screen
support with  "xrandr" instead of xinerama, which doesn't work well with
toshutils

-- 
Fail to switch bwteen CRT and LCD
https://bugs.launchpad.net/bugs/163877
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