
Change your Mac displayâs brightness
You can adjust the displayâs brightness manually or automatically.
Use the brightness function keys
If the screen seems too light or too dark, you can adjust your displayâs brightness.
On your Mac, press
or
(or use the Control Strip).
Automatically adjust brightness
If your Mac has an ambient light sensor, choose Apple menu
> System Settings, then click Displaysin the sidebar. (You may need to scroll down.)
Turn on âAutomatically adjust brightnessâ.
If you donât see the Automatically adjust brightness option, you can manually adjust the brightness.
Turning off auto-brightness may affect battery life, energy consumption and long-term display performance.
Manually adjust brightness
On your Mac, choose Apple menu
> System Settings, then click Displaysin the sidebar. (You may need to scroll down.)
Drag the Brightness slider to adjust the brightness of your display.
Depending on the type of display connected to your Mac, you may also see a Contrast slider that you can use to adjust the displayâs contrast.
If your display is slow to reach full brightness
If your Mac display is slow to reach full brightness, try these solutions.
Give the display time to warm up.
Make sure the display brightness isnât turned off. Press
to check or adjust the level of brightness.
Turn on the ambient light sensor so your Mac can automatically adjust brightness based on current ambient lighting conditions. Choose Apple menu
> System Settings, click Displaysin the sidebar (you may need to scroll down), then turn on âAutomatically adjust brightnessâ or âAmbient light compensationâ.
These options appear only if your Mac has an ambient light sensor.
For specific information about the brightness of your display, check the documentation that came with your display.