We know that the contrast keys on PowerBooks work if you have the Display preferences panel open. Apparently, this is because of a process called DisplayServices, which is located in System/Library/Displays.
If you have this app run everytime you log in (by dropping it into the login preferences panel) then your contrast keys should work. This worked for me, albeit with approximately 1 minute of testing.
Loren
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Mac OS X Hints
http://hints.macworld.com/article.php?story=20010412130425200