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Name

uselessd-suspend.service, uselessd-hibernate.service, uselessd-hybrid-sleep.service, uselessd-sleep — System sleep state logic

Synopsis

uselessd-suspend.service

uselessd-hibernate.service

uselessd-hybrid-sleep.service

/usr/lib/systemd/system-sleep

Description

uselessd-suspend.service is a system service that is pulled in by suspend.target and is responsible for the actual system suspend. Similarly, uselessd-hibernate.service is pulled in by hibernate.target to execute the actual hibernation. Finally, uselessd-hybrid-sleep.service is pulled in by hybrid-sleep.target to execute hybrid hibernation with system suspend.

Immediately before entering system suspend and/or hibernation uselessd-suspend.service (and the other mentioned units, respectively) will run all shell scripts with the .sh extension in /usr/lib/systemd/system-sleep/.

Note that scripts dropped in /usr/lib/systemd/system-sleep/ are intended for local use only and should be considered hacks. If applications want to be notified of system suspend/hibernation and resume, there are much nicer interfaces available.

Note that uselessd-suspend.service, uselessd-hibernate.service, and uselessd-hybrid-sleep.service should never be executed directly. Instead, trigger system sleep states with a command such as "systemctl suspend" or similar.

Internally, this service will echo a string like "mem" into /sys/power/state, to trigger the actual system suspend. What exactly is written where can be configured in the "[Sleep]" section of /etc/systemd/sleep.conf. See systemd-sleep.conf(5).

Options

uselessd-sleep understands the following commands:

-h, --help

Print a short help text and exit.

--version

Print the systemd version identifier and exit.

suspend, hibernate, hybrid-sleep

Suspend, hibernate, or put the system to hybrid sleep.

See Also

systemd-sleep.conf(5), systemd(1), systemctl(1), systemd.special(7), systemd-halt.service(8)