We are so used to think that linux is an OS hard to handle, that sometimes we think we have no “out of the box” solutions.
I had a small problem with the brightness of the screen when on battery power (too dark to work), I have searched google and foruns and in most of them people were saying that it could be a problem, depending if those keys were controlled by hardware or software.
It seems ridiculous now, but all I had to do was click on battery icon and adjust brightness on a battery powered laptop 
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Yeah… but this didn’t work for me… even after restarting X.
Do you have the same laptop? I found out that ubuntu recognizes better this kind of keys. In kubuntu, sound and luminosity keys did not work at first, but in ubuntu is automatic…