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pokhrelankit
User level: Level 1 (4 points)

MacBook Rapid Brightness changes cause white flickers!

Why does Apple keep messing up the brightness setting in every new update [Mac], and then fix it later in a patch? The problem is that when you decrease the brightness from the brightness bar rapidly, like from zero to max and vice versa, rapid white flickers appear on the screen, and it's scary. My heart skips a beat! Duhhh

Posted on Sep 16, 2026 7:31 AM

2 replies

kaz-k
User level: Level 9 (53,902 points)

Sep 16, 2026 10:23 AM in response to pokhrelankit

Hi,

Rapid brightness changes causing white flickers on a MacBook is usually triggered by a conflict between macOS accessibility features, display sensors, or recent OS bugs lagging the display driver, I guess.

Try following method.

Turn off "Dim Flashing Lights" (Most Likely Culprit)

An accessibility feature introduced in macOS can overcorrect during fast brightness or scene transitions, causing severe screen artifacts and flashes.

  • Go to System Settings > Accessibility > Display.
  • Toggle off Dim flashing lights.


pokhrelankit Author
User level: Level 1 (4 points)

Sep 16, 2026 10:50 AM in response to kaz-k

Hey!


The dim flashing light is already turned off. This happens with every new update, and the patch often fixes this issue.

Originally posted at discussions.apple.com/thread/256358212