Brightness issue BackTrack 5 r2

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http://www.backtrack-linux.org – hi all, I've got an hp 6735s with an amd/ati hd 3200 graphics card, I installed bt5r2 but the brightness is very low, so I searched in google how to solve it but nothing, so if there is someone that can guide me step-by-step or post any guide it would great ;) Thanks pinguser (HowTos)