Monday, January 13, 2020

macos - Disable clamshell mode in OS X Mountain Lion

I am running OS X 10.8.5 with an external monitor, and whenever I close the lid of my laptop it automatically goes into clamshell mode so that all the screen contents switch to the external monitor.


When I was running OS X 10.6.8, the machine will go into sleep when I close the lid so that the external monitor goes blank.


What setting(s) should I change in 10.8.5 to bring back the 'sleep' behavior?

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