Screen dims slightly while I'm working.

I just got my new MacBook Pro yesterday. So I'm surprised that it seems to be malfunctioning already. Specifically, while I'm working the screen will dim slightly even though I am typing or working. Thoughts?

This is because of the ambient light sensors, which are, as the poster above mentions, located under the speaker grills. If you don't wish to turn off this feature, just don't hold your hands over the speaker grills making a shadow. (I am a two-finger typist, so I tend to shadow the left sensor often.) Once I realized what I was doing, it doesn't bother me so much. It's more pronounced at low brightness settings.
Hope this answers your question.

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    Message was edited by: mattathayde
    Message was edited by: mattathayde

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