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Brightness control and dual 24" LED Displays

Discussion in 'Mac Pro' started by Greatbug, Apr 26, 2009.

  1. macrumors newbie

    #1
    I've got a 2009 Mac Pro with both a 4870 and a GT120, and I'm experiencing a strange bug with the brightness controls. The keyboard buttons only control one panel, and *both* of the sliders in the displays system preferences panels only control that same display. There is way to control the brightness of the other panel.

    Here's a short clip of the problem:

    http://www.youtube.com/watch?v=gjXZjzQt440

    Any thoughts?
     
  2. macrumors 6502

    ender78

    #2
    Wow that is quite a bug. I'd love to see who else has this problem as I'm looking at picking up a second display and a GT120 like your setup. Have you called Apple about this yet?
     
  3. macrumors regular

    #3
    I know this is a stupid question but are both monitors USB'd in to the Mac Pro? I remember when I first hooked up my LED 24" I forgot to put in the USB cord to the computer and was freaking out why I couldn't change the brightness.
     
  4. macrumors newbie

    #4

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