# systemd-suspend.service

## 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. An environment variable called
           "SYSTEMD_SLEEP_ACTION" will be set and contain the sleep action
           that is processing. This is primarily helpful for
           "suspend-then-hibernate" where the value of the variable will be
           "suspend", "hibernate", or "suspend-after-failed-hibernate" in
           cases where hibernation has failed. 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
           user.slice will be frozen while the executables are running, so
           they should not attempt to communicate with any user services
           expecting a reply.
    
           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 Locks******[1].
    
           Note that systemd-suspend.service, systemd-hibernate.service,
           systemd-hybrid-sleep.service, and
           systemd-suspend-then-hibernate.service should never be executed
           directly. Instead, trigger system sleep with a command such as**systemctl suspend** or **systemctl hibernate**.
    
           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).
    
           Note that by default these services freeze user.slice while they
           run. This prevents the execution of any process in any of the user
           sessions while the system is entering into and resuming from
           sleep. Thus, this prevents the hooks in
           /usr/lib/systemd/system-sleep/, or any other process for that
           matter, from communicating with any user session process during
           sleep.
    


## 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** , **suspend-then-hibernate** , **hybrid-sleep**
               Suspend, hibernate, suspend then hibernate, or put the system
               to hybrid sleep.
    
               Added in version 203.
    


## NOTES



            1. Inhibitor Locks
               https://systemd.io/INHIBITOR_LOCKS
    


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