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If you have a touch bar it does, in my experience. Tap the brightness button to open up controls for each monitor.

I don't have a touchbar mac to test, but does it work with external non-apple displays? Via Karabiner you can configure keys to change the external display brightness. Works great on a Thunderbolt Display. Completely ignores my Dell / LG.

The main reason why I think this wouldn't work is because in the display properties there's no brightness slider for non Apple external displays. There is one for Apple displays.

Yep, works with my external non-Apple display, LG.

I have touchbar, it only sets brightness of laptop, not external

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