65.5 Always On Power Management
20190812 Laptops generally aim to reduce their power consumption through sleep and suspend modes. However, sometimes we want to treat a laptop as a server that should never shut down. For example, a retired or superseded laptop can work as a powerful server. The trick here is to ensure the laptop can boot, connect to the network, and remain on without having to log in to any user account. Particularly to also stop the laptop from sleeping when the lid is closed.
220.127.116.11.1 Ignore Lid Closing To ignore the lid closing event, and so
to retain the on-state of the laptop, edit
/etc/systemd/logind.conf to set
HandleLidSwitch=ignore. The default is usually to
suspend. Then restart the service:
$ grep HandleLidSwitch= /etc/systemd/logind.conf #HandleLidSwitch=suspend $ sudo perl -pi.bak -e 's|#HandleLidSwitch=suspend|HandleLidSwitch=ignore|' /etc/systemd/logind.conf $ grep HandleLidSwitch= /etc/systemd/logind.conf HandleLidSwitch=ignore $ wajig restart systemd-logind
Another suggestion not tried:
# Disable suspend $ sudo systemctl mask sleep.target suspend.target hibernate.target hybrid-sleep.target # Re-enable suspend $ sudo systemctl unmask sleep.target suspend.target hibernate.target hybrid-sleep.target
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