I have the Power settings "for plugged in" with external monitor connected for it to "do nothing" when the lid is closed. See the attached screenshot. However, my laptop still goes to sleep and I can not wake it up without opening the lid.
2 Answers
Perhaps this could be related to this bug: https://github.com/elementary/switchboard-plug-pantheon-shell/issues/219
I came up with a solution. If I go to the "Security & Privacy" settings and go to the Locking tab and set "Lock on suspend" and "Lock after screen turns off" both to OFF, I can wake my laptop back up without having to open the laptop lid.