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I have a Macbook Pro with Mac OS X 10.7, and an external display screen attached to my Macbook, which is working fine.
Sometimes, I have to switch the second display to a projector (because I want to give a presentation).

Those settings (e.g. arrangement, resolution) are different from my external display screen. In 90% of the cases, Mac OS X knows which arrangement/resolution I want, depending on the type of external screen; in 10% of the cases, it's mixing up the configurations and I have to manually edit the configuration again.

Can I see somewhere what configuration is attached to a certain display?
Why does Mac OS X mix the configuration settings between my external display screen and my projector?

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1 Answer 1

1) You should be able to see these configurations in System Preferences > Display. I believe you go to to Layout (or could be called mirroring).

2) OS X displays two Display panels so you know which panel is attached to which screen.

If the Display options don't allow you to pick a resolution, change the Resolution from "Best for XX display", that will allow you to pick a supported, lower, resolution.

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1) I can see the current configuration, but not other configurations (when I attach my external LCD screen, I cannot see the configuration of my projector) 2) yes, but it's showing an incorrect display –  Jochen Hebbrecht Aug 31 '12 at 6:29
    
So the additional panel says something along the lines of Generic LCD? –  squarefrog Aug 31 '12 at 7:43
    
@ squarefrog: what do you mean with your last question? –  Jochen Hebbrecht Sep 10 '12 at 15:18
    
In the additional display config panel, it should say the name of the display at the top. I'm asking if it says Generic LCD or something similar? –  squarefrog Sep 11 '12 at 10:37
    
@ squarefrog: it was saying the name of the projector, but it should have said the name of my LCD screen –  Jochen Hebbrecht Sep 11 '12 at 13:51

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