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>These usually get neither an LED nor a switch

Lots of ThinkPads have «Microphone is muted» LED. Not exactly what's requested (and is bound to a software mute/unmute shortcut), but it's better than nothing regarding state of machine being observable with a quick glance.

▲ mkj 15 hours ago | parent [-]

That one seems to be software controlled. I'm fairly sure I remember having the mic working with the mute LED lit, which was confusing. That was on a x1 carbon gen9.

	▲	throwaway74354 13 hours ago \| parent [-]
		Correct, its usefulness depends on software working as expected (and not being tampered with) `echo 1 \| sudo tee /sys/devices/platform/thinkpad_acpi/leds/platform\:\:micmute/brightness` is enough to turn the LED on without muting the mic.