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GitHub - MonitorControl/MonitorControl: 🖥 Control your display's brightness & volume on your Mac as if it was a native Apple Display. Use Apple Keyboard keys or custom shortcuts. Shows the native macOS
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Help-not able to adjust display brightness on external monitor after macOS beta update. | MacRumors Forums
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How Do I Control the Brightness of an External Monitor In macOS? | by Jakub Jirak | TechLife | Medium
Mac app MonitorControl changes the brightness / volume of an external monitor