notebook hp x360 13-4002dx new install 16.04 same issue "Notebook doesn't suspend when lid is closed" adding HandleLidSwitchDocked=suspend in /etc/systemd/logind.conf fix issue.
If need more info for making proper fix - ask
notebook hp x360 13-4002dx Docked= suspend in /etc/systemd/ logind. conf fix issue.
new install 16.04
same issue "Notebook doesn't suspend when lid is closed"
adding HandleLidSwitch
If need more info for making proper fix - ask