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On my MacBook Pro 2012, I can't change the screen brightness. When I click on the brightness keyboard controls, nothing happens. Under System Preferences → Displays, the Brightness slider is missing:

SP SS

I have also tried with an AppleScript and when I run it, I hear an error sound:

tell application "System Events"
    key code 107
end tell

Where does the problem come from? How do I adjust the brightness?

  • Do the F1 and F2 function keys work to control brightness? Note: Depending on System Preferences > Keyboard, you might have to press the Fn key as well. If [√] Use F1, F2, etc. keys as standard function keys is checked you need to use Fn key too. – user3439894 Jun 17 at 19:54
  • @user3439894 i tried with both... – Pol Jun 17 at 20:19
  • @user3439894 also the keys for the keyboard brightness are working – Pol Jun 17 at 20:23
  • Welcome to Ask Different :) Try using this app to adjust screen brightness: Shades. – Nimesh Neema Jun 18 at 2:04
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Restarting the Mac fixed the issue for me. I can now set the screen brightness alright.

Apparently it's a mysterious bug in macOS.

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