I am trying to disable the "clam shell" mode of my MacBook (13" early 2011 Unibody) running macOS High Sierra. I want the computer to sleep when the lid is closed even when it is connected to power and an external monitor.

After disabling SIP I was able to edit the com.apple.Boot.plist file and add Kernel Flags iog=0x0as I have done in previous version of macOS, but the setting doesn't appear to work in High Sierra.

Also sudo nvram boot-args=iog=0x0 from (recovery mode) terminal writes the entry, but also has no effect.

Is there any way to achieve lid close > sleep with external monitor and AC power in High Sierra?

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