One of the requirements to use clamshell mode is to have the power adapter plugged in. Is their any file modification or app that will work around this? Like to switch throughout the day from a sit down desk to stand up and bringing the power adapter back and forth, is becoming more of a hassle.

  • Clamshell works for me with or without power adapter... running 10.11.6 El Capitan – Bhang Bhosadda Oct 30 '16 at 1:57
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    Welcome to Ask Different! This does not answer the question; stating that Clamshell mode works with/without power adapter does not help answer the question. Perhaps you could include the settings you have made, or anything that affects this outcome? – Brick Oct 30 '16 at 2:54
  • I didn't change anything at all, was just trying to say it works out of the box as intended for me...only reason I brought up clamshell with/without adapter is because that's what the title of the thread is; also mentioned in first post – Bhang Bhosadda Oct 30 '16 at 4:59
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    Per the Apple support link the OP provided, Mac laptops must be plugged in in order for "closed-display" or clamshell mode to work. The fact that you are stating it works differently means it is actually not working as intended on your computer. – tubedogg Oct 30 '16 at 5:29
  • Oh well, I've never had any problems with it, this is something I use daily; thought it worked that way for everybody – Bhang Bhosadda Oct 30 '16 at 11:28

You can use Insomniax to disable sleep when the display is closed. This will mean that you can close the lid and display the screen on a secondary monitor mode without needing to have a power adapter connected as the Mac will not sleep when you close the lid.

Insomniax is now abandonware and no further updates or binaries will be supplied. Further info.

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    Works perfectly. – tron_jones Jan 5 '15 at 20:26
  • On opening the link of Insomniax, it gives Cannot GET /projects/insomniaxinfo/ – Mozak Mar 8 '20 at 11:13

An extension called nosleep does exactly this. Free and easy to set up!

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