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SYSTEMD-SUSPEND.SERVICE(8)  systemd-suspend.service SYSTEMD-SUSPEND.SERVICE(8)
NAME
       systemd-suspend.service, systemd-hibernate.service, systemd-hybrid-
       sleep.service, systemd-suspend-then-hibernate.service, systemd-sleep -
       System sleep state logic
SYNOPSIS
       systemd-suspend.service
       systemd-hibernate.service
       systemd-hybrid-sleep.service
       systemd-suspend-then-hibernate.service
       /usr/lib/systemd/system-sleep
DESCRIPTION
       systemd-suspend.service is a system service that is pulled in by
       suspend.target and is responsible for the actual system suspend.
       Similarly, systemd-hibernate.service is pulled in by hibernate.target
       to execute the actual hibernation. Finally,
       systemd-hybrid-sleep.service is pulled in by hybrid-sleep.target to
       execute hybrid hibernation with system suspend and pulled in by
       suspend-then-hibernate.target to execute system suspend with a timeout
       that will activate hibernate later.
       Immediately before entering system suspend and/or hibernation
       systemd-suspend.service (and the other mentioned units, respectively)
       will run all executables in /usr/lib/systemd/system-sleep/ and pass two
       arguments to them. The first argument will be "pre", the second either
       "suspend", "hibernate", "hybrid-sleep", or "suspend-then-hibernate"
       depending on the chosen action. Immediately after leaving system
       suspend and/or hibernation the same executables are run, but the first
       argument is now "post". All executables in this directory are executed
       in parallel, and execution of the action is not continued until all
       executables have finished.
       Note that scripts or binaries dropped in /usr/lib/systemd/system-sleep/
       are intended for local use only and should be considered hacks. If
       applications want to react to system suspend/hibernation and resume,
       they should rather use the Inhibitor interface[1].
       Note that systemd-suspend.service, systemd-hibernate.service, and
       systemd-hybrid-sleep.service systemd-suspend-then-hibernate.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 or a sleep.conf.d file. See systemd-
       sleep.conf(5).
OPTIONS
       systemd-sleep understands the following commands:
       -h, --help
           Print a short help text and exit.
       --version
           Print a short version string and exit.
       suspend, hibernate, hybrid-sleep, suspend-then-hibernate
           Suspend, hibernate, suspend then 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)
NOTES
        1. Inhibitor interface
           https://www.freedesktop.org/wiki/Software/systemd/inhibit
systemd 239                                         SYSTEMD-SUSPEND.SERVICE(8)