Brightness control and dual 24" LED Displays

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

  1. Greatbug macrumors newbie

    Dec 7, 2002
    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:

    Any thoughts?
  2. ender78 macrumors 6502

    Jan 9, 2005
    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. superscientific macrumors regular

    Mar 18, 2003
    Spring Hill, TN
    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. Andreas77 macrumors member

    Apr 29, 2009

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