8

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?

4
  • 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. Jun 17, 2019 at 19:54
  • @user3439894 i tried with both...
    – Pol
    Jun 17, 2019 at 20:19
  • @user3439894 also the keys for the keyboard brightness are working
    – Pol
    Jun 17, 2019 at 20:23
  • Welcome to Ask Different :) Try using this app to adjust screen brightness: Shades.
    – Nimesh Neema
    Jun 18, 2019 at 2:04

1 Answer 1

13

Restarting the Mac fixed the issue for me. I can now set the screen brightness alright.

Apparently it's a mysterious bug in macOS.

Update: @uzair-hayat pointed out that changing the Display Scale in Settings will bring back the brightness slider.

Brightness Display Settings

3
  • Thanks, just went through exactly the same thing on my mid-2014 Macbook - keys didn't work and brightness slider was missing from Displays panel. Catalina 10.15.5
    – Andy Dent
    Jun 26, 2020 at 4:14
  • 6
    While restarting would hopefully do the trick, another thing that worked for me is to change the Display Scale, after which things were back to normal for me. Dec 5, 2020 at 2:00
  • Genius comment, yes, changing the scale helped me regain control of my brightness without a restart
    – Andrei
    Jun 18, 2021 at 21:10

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