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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 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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closed as off topic by Daniel, Dori Nov 9 '11 at 7:57

Questions on Ask Different are expected to relate to Apple hardware or software within the scope defined by the community. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about reopening questions here.If this question can be reworded to fit the rules in the help center, please edit the question.

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
I have the same question, and I'm looking for a utility to change backlighting through DDC. No point though if the adapter doesn't support it. The one program I tried didn't work. – Andreas Jan 7 '15 at 15:08