How To Control And Adjust Monitor Brightness On Mac?

To control and adjust monitor brightness on a Mac, you have several options:

1. Built-in System Settings:

   • Open System Settings (Preferences) > Displays.
   • Drag the Brightness slider on the right to adjust the brightness of your display.
   • If your Mac has an ambient light sensor, turn on "Automatically adjust brightness" on the right.

2. Keyboard Function Keys (for built-in display or external displays with DDC support):

   • Press the increase brightness key (often F1) or the decrease brightness key (F2) to adjust the brightness.

3. Use a Third-Party App (for external displays, some with DDC support required):

   • You can use tools like MonitorControl (mentioned in) or Lunar (mentioned in) to adjust the brightness of your external displays. Install the app, grant the necessary permissions in "Security & Privacy" > Privacy > Accessibility, and use the app's interface to adjust the brightness.

For external monitors where the above methods may not work, you can try setting the external monitor as the primary display temporarily:

4. Manually Set the External Monitor as Primary (for certain external displays):
   • In System Preferences > Displays > Arrangement tab, drag the white bar (indicating the primary display) to the external monitor.
   • You can then adjust the brightness on the external display using sliders or keyboard brightness keys.
   • After adjusting the brightness, drag the white bar back to your primary display.

Please note that the availability and functionality of specific methods might depend on your Mac's operating system version and the specifications of your monitor(s).