Screen brightness in Ubuntu not working

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http://askubuntu.com – Hardware: HP DVD6t, AMD Radeon 6700 OS: Natty 32-bit I have researched a lot on this and basically most of the solutions that are on the internet / stackexchange revolves around the brightness buttons not working. If you are brightness buttons are not working then you can do a million things to get it work i) install applets ii) modify /etc/brightness file iii) write scripts to modify brightness. However, my problem is not brightness buttons, but the brightness delivered by the video driver itself. My brightness is set to 0, but still actual_brightness shows 5 I'd like to add that I use a (HowTos)