As far as I know the mic is still shut off when the machine is set to clamshell mode. That's the point. You cannot use the mic when the lid is closed. It's a hardware cut-off, you cannot configure it in software. Hence my comment about the bug bounty.

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aae42 6 days ago | parent [-]

$5 USB mic?

	▲	arcticbull 6 days ago \| parent [-]
		If the point is to hide the recording that's not a great way. Especially when many corporate IT solutions monitor USB device connections.