Brightness Options Missing

Discussion in 'macOS' started by theBigD23, Apr 7, 2017.

  1. theBigD23 macrumors 6502a

    Joined:
    Sep 13, 2008
    #1
    I'm not sure what to do. I have a 5K iMac and a non-Thunderbolt display connected. However, the secondary display, I cannot control the brightness. In System Preferences > Displays, there isn't a slider for brightness for the secondary display.

    I've tried Control/Option/Command/FN + F1/F2 and it won't do it.

    Any ideas?

    Display.png
     
  2. Yahooligan macrumors 6502a

    Yahooligan

    Joined:
    Aug 7, 2011
    Location:
    Illinois
    #2
    You have to have the USB cable from the Cinema Display plugged into the computer as well, there's no brightness control when you only have the miniDP cable connected.
     
  3. theBigD23 thread starter macrumors 6502a

    Joined:
    Sep 13, 2008
    #3
    Thanks, but I did have the USB plugged in and tried a different port. Same result.
     
  4. Yahooligan macrumors 6502a

    Yahooligan

    Joined:
    Aug 7, 2011
    Location:
    Illinois
    #4
    Ok, so a couple more things to try...
     
  5. theBigD23 thread starter macrumors 6502a

    Joined:
    Sep 13, 2008
    #5
    Thank you! The EDID Reset Tool did it. Thanks!
     

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