Brightness on laptop doesn't change
I recently installed Ubuntu 10.04 LTS on my ASUS UL20A-A1 laptop through Wubi. I am loving it so far but there is one really annoying issue. Whenever I try to adjust my screen brightness by pressing Fn>F5/F6, the brightness meter on the top flashes, and the brightness doesn't change, not even when I plug in my laptop. And after I try adjusting the brightness once, the brightness meter keeps popping up randomly without my pressing of the button, and there is no way to stop it popping up. This is really irritating and I really want to use Ubuntu but this is a serious problem for me. Does anybody know how to fix this?