I have the same problem on my Toshiba Tecra M9. It works fine with the nv 
driver. With the nvidia driver it only works on tty, not for X11.
ref.: http://www.nvnews.net/vbulletin/showthread.php?t=100494&page=3
Tested this with hardy live cd (which has the latest nvidia driver) and it is 
not fixed there, for me.

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[gutsy] brightness keys only pop up a slider on a t61p, they don't affect 
screen brightness
https://bugs.launchpad.net/bugs/151828
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