Summary: Laptop lid, when closed, will suspend even if there is an external monitor plugged in
With no external monitors plugged in, closing a laptop's lid will suspend the machine (as set by the lid-close-battery-action and lid-close-ac-action keys). By default, however, closing the lid when an external monitor is present will not suspend the machine, so that one can keep working on that monitor (e.g. for docking stations or media viewers). Set this key to False to keep the default behavior, or to True to suspend the laptop whenever the lid is closed and regardless of external monitors.