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7020100
(Get the code!)
I've got a similar issue. I've got a Dell 1420n with Ubuntu preloaded, upgraded to gutsy.
On AC power, after a short period of inactivity (not what I have set in Power Management) the screen brightness will turn back to 100% (as it is set in Power Management) regardless of what has been done with the Fn keys. New activity does not reverse this brightness adjustment.
On battery power, after a short period of inactivity (not what I have set in Power Management) the screen brightness will turn down to 70% (as it is set in Power Management) regardless of what has been done with the Fn keys. New activity does not reverse this brightness adjustment either.
I can't tell if this is a poorly implemented feature or just a glitch, but if there is going to be autodimming it should be reversed when activity resumes. And there should be no autodimming on AC power.