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Originally Posted by ottischwenk
Or an error in the design concept.
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No. There are light sensors in there, on all 4 sides, I think. So these function as light wells.
I noticed that there is not the usual transparent window(s) in the bezel, which is how it's usually done and it occurred to me that they must be in the slots. Coincidentally, right about that time there was a post from someone who had covered them up with those decals some people like use to personalize. When I asked them to turn on auto brightness (they don't normally use it), they said it went down to 2!
And indeed, I can confirm: when I cover one slot, brightness goes down a couple of notches, and when I cover all of the slots, brightness decreases proportionately. Uncover, it bumps back up. (though it seemed to get stuck at one point. I restarted and it's working as described.)
Or maybe the edge of the glass functions as a light guide to channel it to the sensor(s). We should learn more when someone does a teardown.
So while it is unusual, it's the way it is designed, not some design or assembly goof up. I'd love to know how and why they came up with this solution, and didn't just use something more conventional.