I've repeatedly encountered an issue where putting my phone, or headphones, or a magnet (the magnetic power adapter thing) near the speaker port on the left side of a rMBP (or on top of the speaker holes nearby) will cause the display to go to sleep. Is this an intentional design?
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It's way more common than what you think. Many consumers electronics depends on this kind of sensors. The reason behind this is that you can conceal a small magnet away from the user and not use a mechanical, or piezoelectric, switch. Which will get stuck with dirt over time, asides from being plain ugly.
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