Brightness Options Missing

theBigD23

macrumors 6502a
Original poster
Sep 13, 2008
604
105
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
 

Yahooligan

macrumors 6502a
Aug 7, 2011
965
113
Illinois
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.
 

theBigD23

macrumors 6502a
Original poster
Sep 13, 2008
604
105
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.
Thanks, but I did have the USB plugged in and tried a different port. Same result.
 

theBigD23

macrumors 6502a
Original poster
Sep 13, 2008
604
105
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