Macbook screen fades

HI All,
I have a new unibody macbook. Periodically the screen fades to almost black (like it goes before starting front row). It doesn't seem to be related to key combinations or whether powered/ on battery. It is still awake and some period later (usually less than a minute or 2) it comes back on and all running processes seem to be working as per normal. This return to normal screen function can be expedited by closing the lid and allowing it to go to sleep and then opening the lid. Anyone got the same problem? Any solutions?
Thanks

Welcome to Apple Discussions!
First thing I'd check is the ambient light sensor. When the brightness decreases on your own are you putting your hand over the iSight sensor? Is the light in the room you are in decreasing? You can shut this off by unchecking "automatically adjust brightness as ambient light changes" in the display prefs. Also, see if turning up the brightness on the keyboard helps when this happens.

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