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    TL;DR: Yep, the electric circuit shows that the microphone is powered off on mute.

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      …now that I think of it, an easier approach without needing to decap chips would be to probe the microphone’s traces with the power on and off. This approach is more conclusive though.

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        Yes, that would tell you whether you could get a signal from the mic at that moment, but not whether the power to the mic is under software control.