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I developed a Cocoa based OS X app to set brightness and contrast of a monitor using DDC/CI communication.

The app works perfectly using a Mac Pro attached to a BenQ DDC/CI capable monitor. It works with every connection interface: VGA, DVI and HDMI.

If I attach the same BenQ monitor to a MacBook via Apple Mini DisplayPort to VGA adapter, the app isn't able to send DDC/CI commands to the monitor...it reports that the monitor isn't DDC/CI capable.

I'm sure it is not an issue related to the app. It detects correctly both of the monitor (the internal and the external one) and I'm sure that I'm sending DDC/CI commands to the external monitor and not to the internal one.

Does Apple Mini DisplayPort to VGA adapter support DDC/CI?

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How this question is supposed to be off-topic? It's exactly about Apple hardware.. –  Andrea3000 Nov 23 '11 at 22:42
    
Calling this off topic is silly. @Andrea3000, are you able to share this app? I am searching for a software tool that can set monitor brightness and contrast. Is it for sale? –  hekevintran May 22 '12 at 16:32
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closed as off topic by Daniel Lawson, Dori Nov 9 '11 at 7:57

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