I have tried reading the HP EliteBook 2540p manual but it does not seem to label it anywhere.

I've noticed that this model in particular isn't the only one, there are quite a few models that have it and I'm not entirely sure what it is, my first thought is that it's a webcam but the webcam is at the top of the screen on this model?

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I'm guessing that its an ambient light sensor - which the specifications confirms it has. Apparently they arn't terribly good, and there's a quite of information on how to turn them off, but I'm reasonably certain that's what it is.

  • 1
    Oh yeah that would make sense because if you press fn + F11 then it toggles the ambient light sensor. Yup, page 18 of the manual confirms it, thanks!
    – ThreaT
    Aug 25 '14 at 8:09

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