Apple Wireless Keyboard cannot control brightness when external monitor plugged in

Discussion in 'Mac Accessories' started by celticpride678, Aug 8, 2009.

  1. celticpride678

    Feb 15, 2009
    Boston, MA
    When I have my external monitor plugged in, I cannot control the brightness on my MacBook's screen using the Apple Wireless Keyboard. However, I can control the brightness using the keys on the actual Mac keyboard. Also, when the display is NOT plugged in, I can use the brightness controls on the keyboard and the Mac. What's going on here? Is this normal? Any ideas on how to fix it? Thanks.
  2. rkdiddy macrumors 65816


    Mar 19, 2008
    OC Baby!
    Thinking back to when I had my ACD - I believe that is normal.
  3. celticpride678 thread starter Guest


    Feb 15, 2009
    Boston, MA
    I solved the issue. When the main display is on my external monitor, it controls the brightness. However, when the main display is my Macs display, the keyboard works fine with brightness.
  4. toptekjon macrumors member


    Jul 16, 2008
    Great tip, that worked for me too!! Having the primary display set to the macbook LCD allows the keyboard to control screen brightness.
  5. dannybuoy macrumors newbie

    Dec 6, 2010
    Solved Problem

    I have a 27" Apple Display external monitor and for some reason my apple wireless keyboard would not control the brightness.

    Well after a little investigation, I realized that I had forgotten to plug in the USB cable from the monitor. Once I did - I regained brightness control.

    Hopefully this helps someone else.


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