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If your Mac 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 isn’t 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 “Automatically adjust brightness” or “Ambient light compensation”.
These options appear only if your Mac has an ambient light sensor.