Screen Brightness controls don't work in Lion. (Macbook pro 5,1 (Late 2008))

Screen brightness no longer adjustable; all other function keys work.
Help !

You seem to have a situation similar to mine. If I understand correct, your display works perfectly when the brightness buttons work, but when the brightness buttons do not work, your screen dims from, say 100% to maybe 50%, and then back again... all on its own and at random intervals?
That's what is happening to me, is that happening to you too? Just wondering if you found a fix for this since your post.

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Screen Brightness controls don't work in Lion. (Macbook pro 5,1 (Late 2008))

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