Take the 2-minute tour ×
Ask Different is a question and answer site for power users of Apple hardware and software. It's 100% free, no registration required.

I have a late 2012 27" iMac as my primary monitor also connected to a late 2009 27" iMac as a secondary monitor via a mini-display port to mini-display port cable. I also have a Dell 24" monitor connected to the late 2012 27" iMac as a third monitor.

I can change the brightness on the Dell monitor manually with the Dell hard buttons but I cannot change the brightness on the late 2009 iMac using the keyboard attached to the late 2012 iMac

Is there anyway to change the brightness on the iMac which is serving as a secondary display?

Other details:

  • I don't want to use the software Shades as it’s a memory hog and leaks memory
  • I'm using a wired Mac keyboard connected via usb to the late 2012 iMac
  • control + F1 or control + F2 does not work.
share|improve this question
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.