Is it the keys that specifically are not working, or is it more properly
the backlight adjustment that is not working?  That is, when you hit the
backlight +/- Fn keys, does Ubuntu respond by showing the notification
bubble indicating the brightness level with a bar by the system tray, or
do the Fn keys simply not produce any response at all?

My LCD backlight brightness adjustment stopped working in Karmic after
some package update.  The Fn keys still work for me, as in Ubuntu sees
the key press events and tries to change the display backlight
brightness, but the LCD backlight doesn't change brightness.  Writing to
/sys/class/backlight/nvidia_backlight/brightness also produces no
change.

-- 
FN Brightness keys stopped working on Macbook4,1
https://bugs.launchpad.net/bugs/509508
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