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I read the same problems but I didn't find an answer.

I can change my brightness by slider in "brightness and lock" but when I press the key button it goes to lowest level and when I press the other button it just become lighter just one level and I just can switch between this two dark levels.

Is there anyway I can repair it without changing it manually?

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Can you add the model of laptop it is? This question is unanswerable without knowing more about the hardware – Jorge Castro Nov 10 '12 at 13:04

If anyone's still watching this post, I found an answer to this question and posted an answer here: Cannot change brightness

Hope this helps.

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