How to disable an internal display in OS X Lion
Apple company has changed the behavior of the MacBooks in the clamshell closed with an external display in Mac OS X Lion, it was a special modification, which can be judged by the documentation: support.apple.com/kb/ht3131
This change completely canceled the ability to set the sleeping mode in the MacBook by closing its clamshell, if an external display is connected. They left no choice for the user.
Recently, on the forums of Apple has appeared the solution that returns the behavior as in Snow Leopard.
We should do the following in a terminal:
sudo nvram boot-args="iog=0x0"
After we reboot a notebook the behavior will change, now when we close the clamshell, it will set a notebook to sleeping mode with the connected external display. Even if we disable a sleeping mode by connecting an external usb-device and opening the clamshell of notebook, then the internal display remains disabled.
This solution works with Air3,2.
We can return the previous setting by following:
sudo nvram -d boot-args
Just in case, if something goes wrong, then we can reset nvram during the load-time by holding down command + option + p + r.
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