Disable Lid Suspend
From Bibliotheca Anonoma
Most laptops suspend when the lid is down and in order to solve this problem for a laptop server, it's better to fix this problem on the systemd level.
Edit /etc/systemd/logind.conf
sudo nano /etc/systemd/logind.conf
Set HandleLidSwitch=ignore
Restart systemd-logind :
sudo systemctl restart systemd-logind
xfce4-power-manager (Crunchbang)[edit]
Sometimes, due to the intervention of graphical utilities, you will need to do a second step: open Power Manager and modify the settings.
