FN keys work at a hardware level, so they always work.
hald-addon-dell-backlight does this:
listen for changes by the FN-keys and notifies software that cares about it 
(through HAL)
lets the brightness be changed by software (through HAL as well), eg, after 
some inactivity

I think this bug can be closed...

-- 
Revision of hald-addon-dell-backlight needed
https://bugs.launchpad.net/bugs/292778
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