laptop suspends with lid closed even when docked

On Ubuntu-GNOME 17.04, my laptop suspends when docked and lid closed (state, not action - the laptop is docked with lid closed before powering on - this still happens).

I have yet to figure out exactly what's happening, but in the default configuration, the system will suspend shortly after login (initial or from locked screen).

Only thing I've found that helps, is HandleLidSwitch=ignore in /etc/systemd/logind.conf.
Forcing HandleLidSwitchDocked=ignore does not help.

The problem with this workaround is that now the system will never suspend on lid close, which is annoying when not docked.

System is a Lenovo T460s laptop.