CrackMacWhy does my MacBook screen keep dimming by itself? How to stop it
Almost always it's a setting doing what it was designed to do. Automatic brightness reacts to light around you, the Mac dims slightly on battery, Low Power Mode lowers brightness, and the display dims before it goes to sleep. Each one is a switch in System Settings. Dimming that only affects part of the screen is a different problem, covered at the end.
Turn off the usual causes
- Automatic brightness. System Settings, Displays. Switch off "Automatically adjust brightness". Shadows, a lamp turning on or your hand over the camera area all trigger it.
- Dimming on battery. System Settings, Battery, Options. Turn off "Slightly dim the display on battery".
- Low Power Mode. In Battery settings, set Low Power Mode to Never, or only on battery if you prefer.
- Display sleep. System Settings, Lock Screen. The display dims shortly before it turns off when inactive. Lengthen those times if it dims while you're reading.
Dimming during video
On MacBook Pro models with a Liquid Retina XDR display, HDR video plays much brighter than everything else, so the rest of the screen can look dim beside it. Automatic brightness can also react to a dark scene. Turning off automatic brightness usually settles it.
When it isn't a setting
- The screen gets dimmer over months even at full brightness. The backlight is ageing.
- One part of the screen is darker than the rest. That's damage to the backlight or panel in that area, often after pressure or a spill.
- Dimming comes with flicker. See screen flickering.
If the damage runs along one edge, CrackMac can keep windows, menus and the pointer off it. There's a free 30-minute trial.
Quick answers
Why does my MacBook screen dim on its own?
Usually automatic brightness reacting to room light, the setting that dims the display slightly on battery, Low Power Mode, or the display getting ready to sleep. All of them can be turned off in System Settings.
Why does my Mac screen dim when I watch a video?
On MacBook Pro models with an XDR display, playing HDR video can make the rest of the screen look dimmer next to the bright video. Automatic brightness can also react to a dark video scene.
Dimming in one area only?
A screen that dims evenly is a setting. A dark patch or band that stays in one place is damage to the panel or backlight. If it runs along an edge, CrackMac can black it out and keep your work on the rest of the screen.
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