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I can put my MacBook into clamshell mode by just close it and sending some USB/Bluetooth signals.

However, sometimes I want to get into the mode directly without those actions. Is there no button or menu written "Get clamshell mode now"? Or utility?

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What are you meaning when you say Clamshell mode? Do you just want to kill the internal display and only use the external? Because that’s essentially the only difference...Command F1 will let you cycle through the display modes (mirrored, extended, internal display off, etc) –  peelman Jan 20 '11 at 15:35
    
@peelman Your answer is just what I have been found. Thanks! How about to make answer with the reply text? I'll pick it up. –  Eonil Feb 14 '11 at 3:09

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What are you meaning when you say Clamshell mode? Do you just want to kill the internal display and only use the external? Because that’s essentially the only difference...Command F1 will let you cycle through the display modes (mirrored, extended, internal display off, etc)

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Command-F1? Doesn't do anything on my machine (only when external display is connected?). (Fn-)F1 reduces brightness..? –  Daniel Beck Feb 14 '11 at 16:12
    
It should at least be causing a Screen Detection, even if there’s no monitor attached. You sure you haven’t modified a shortcut key to lay over top of it? docs.info.apple.com/article.html?path=Mac/10.6/en/8525.html –  peelman Feb 14 '11 at 16:21
    
oh, and: support.apple.com/kb/ht3131 –  peelman Feb 14 '11 at 16:24
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Thanks again. This answer will help a lot of people :) –  Eonil Feb 15 '11 at 5:19
    
⌘F1 only toggles screen mirroring on my MacBook Air. Maybe something changed on 10.7. –  Lri Sep 19 '12 at 17:32

My favourite utility to do this is an app called InsomniaX, which silently sits in the menubar, and, when enabled, prevents the laptop from sleeping when the lid is closed. I haven't had much success with the automatic clamshell mode, and I'd use this instead.

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