My screen gets dim and the brightness control buttons don't work

My screen is frequently dim.  The brightness control buttons display that they are working, but the brightness doesn't actually change.  Any ideas why and what I can do?

Thanks for the suggestion.  Actually, I had tried that but still had to go into preferences any time I wanted it brighter.  After I posted, I found a thread using some different keywords and found that people were having the same problem with OS versions up to 10.7.2 but solved it with the latest update (10.7.3).  I just installed it and now seem to be able to adjust the brightness with my keyboard no problem.  I appreciate your reply anyway!

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