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My laptop screen brightness just keeps on increasing and decreasing in a loop.

Is there some setting that I have messed up? I am sure the machine should be okay, because it is pretty new still.

I am using Windows XP, and the machine is a DELL Latitude E6400.

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I don't know for this specific laptop, but some laptops have a light sensor that can be used to automatically adjust brightness.

The loop effect can comes from a bad configuration of the electrical network frequency which induce a resonance frequency.

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Hmmm, I keep my light sensor switched off in my Latitude; however, the brightness arbitrarily changes sometimes. Keeping the light sensor switched on makes the brightness change in accordance with ambient lighting. – Sumon Jan 1 at 16:51
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