SYSTEMD-SUSPEND.SERVICE(8) systemd-suspend.service SYSTEMD-SUSPEND.SERVICE(8)
systemd-suspend.service, systemd-hibernate.service, systemd-hybrid-
sleep.service, systemd-sleep - System sleep state logic
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.
Immediately before entering system suspend and/or hibernation
systemd-suspend.service (and the other mentioned units, respectively)
will run all executables in /lib/systemd/system-sleep/ and pass two
arguments to them. The first argument will be "pre", the second either
"suspend", "hibernate", or "hybrid-sleep" 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 /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 systemd-suspend.service, systemd-hibernate.service, and
systemd-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 or a sleep.conf.d file. See systemd-
systemd-sleep understands the following commands:
Print a short help text and exit.
Print a short version string and exit.
suspend, hibernate, hybrid-sleep
Suspend, hibernate, or put the system to hybrid sleep.
systemd-sleep.conf(5), systemd(1), systemctl(1), systemd.special(7),
systemd 229 SYSTEMD-SUSPEND.SERVICE(8)
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