Power management and docks

[John Morris]

Been banging my head against a minor problem for months now.  Finally
giving up and asking...

Have a Thinkpad and a dock.  Mate still allows for this arrangement, I
can even configure it to stay powered on with the lid closed off of the
dock if I want.  The problem is I can't logout and back in or reboot.
The second Mate releases control over power the machine suspends if the
lid is down, like most cases while docked.

Googled, poked around in config files, etc.  Nothing seems to allow
changing of the power policy while at the login screen.  I can totally
disable the lid from /etc/systemd/logind.conf but that is overkill.  I
do want the system to suspend if the AC is disconnected and the lid
closes.