Ok. I found my problem. Was a kernel bug. It should be fixed in 2.6.32.
See
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=d822d5c273683dc4bacd413953b11ad31513e997

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[Karmic] "dim display when idle" only dims but doesn't restore the previous 
value when not idle anymore
https://bugs.launchpad.net/bugs/392122
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