10.7: Disable internal laptop display when external display is attached

Before Lion it was possible to run an external display off a laptop and have the internal display disabled, even if you opened the lid. This can be useful for a myriad of reason including energy saving and better wifi reception. With Lion the internal display will always turn on when the lid is opened, even if there is already an external display connected.


A solution was posted on the Apple support forums by user chenga.8.

To go back to pre-Lion behaviour enter the following command in Terminal:

sudo nvram boot-args="iog=0x0"

To undo this change type type the following command or zap the PRAM (press Cmd+Opt+p+r at power up):

sudo nvram -d boot-args

[crarko adds: I haven't tested this one.]

Source: http://feeds.macosxhints.com/click.phdo?i=e1c834ec84802112c7bee0d5aa11bc6c

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