[lubuntu] Screen Brightness not working.

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http://ubuntuforums.org – Laptop(netbook) in question is a Toshiba NB550D/02F PLL5FA-02F02C(amd c60/hd 6290). I have searched quite a bit but to no luck. My problem is that i cannot set the brightness with the FN keys. The keys work, as in the wee indicter slider pops up in the top right of the screen and slides up or down as i try to change the brightness but the brightness does not change. I hope somebody has a solution for this. Thanks in advance. (Hardware)