1SYSTEMD-SUSPEND.SERVICE(8)  systemd-suspend.service SYSTEMD-SUSPEND.SERVICE(8)
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NAME

6       systemd-suspend.service, systemd-hibernate.service, systemd-hybrid-
7       sleep.service, systemd-suspend-then-hibernate.service, systemd-sleep -
8       System sleep state logic
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SYNOPSIS

11       systemd-suspend.service
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13       systemd-hibernate.service
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15       systemd-hybrid-sleep.service
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17       systemd-suspend-then-hibernate.service
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19       /usr/lib/systemd/system-sleep
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DESCRIPTION

22       systemd-suspend.service is a system service that is pulled in by
23       suspend.target and is responsible for the actual system suspend.
24       Similarly, systemd-hibernate.service is pulled in by hibernate.target
25       to execute the actual hibernation. Finally,
26       systemd-hybrid-sleep.service is pulled in by hybrid-sleep.target to
27       execute hybrid hibernation with system suspend and pulled in by
28       suspend-then-hibernate.target to execute system suspend with a timeout
29       that will activate hibernate later.
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31       Immediately before entering system suspend and/or hibernation
32       systemd-suspend.service (and the other mentioned units, respectively)
33       will run all executables in /usr/lib/systemd/system-sleep/ and pass two
34       arguments to them. The first argument will be "pre", the second either
35       "suspend", "hibernate", "hybrid-sleep", or "suspend-then-hibernate"
36       depending on the chosen action. An environment variable called
37       "SYSTEMD_SLEEP_ACTION" will be set and contain the sleep action that is
38       processing. This is primarily helpful for "suspend-then-hibernate"
39       where the value of the variable will be "suspend", "hibernate", or
40       "suspend-after-failed-hibernate" in cases where hibernation has failed.
41       Immediately after leaving system suspend and/or hibernation the same
42       executables are run, but the first argument is now "post". All
43       executables in this directory are executed in parallel, and execution
44       of the action is not continued until all executables have finished.
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46       Note that scripts or binaries dropped in /usr/lib/systemd/system-sleep/
47       are intended for local use only and should be considered hacks. If
48       applications want to react to system suspend/hibernation and resume,
49       they should rather use the Inhibitor interface[1].
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51       Note that systemd-suspend.service, systemd-hibernate.service,
52       systemd-hybrid-sleep.service, and
53       systemd-suspend-then-hibernate.service should never be executed
54       directly. Instead, trigger system sleep with a command such as
55       systemctl suspend or systemctl hibernate.
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57       Internally, this service will echo a string like "mem" into
58       /sys/power/state, to trigger the actual system suspend. What exactly is
59       written where can be configured in the [Sleep] section of
60       /etc/systemd/sleep.conf or a sleep.conf.d file. See systemd-
61       sleep.conf(5).
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OPTIONS

64       systemd-sleep understands the following commands:
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66       -h, --help
67           Print a short help text and exit.
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69       --version
70           Print a short version string and exit.
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72       suspend, hibernate, hybrid-sleep, suspend-then-hibernate
73           Suspend, hibernate, suspend then hibernate, or put the system to
74           hybrid sleep.
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SEE ALSO

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

81        1. Inhibitor interface
82           https://www.freedesktop.org/wiki/Software/systemd/inhibit
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86systemd 248                                         SYSTEMD-SUSPEND.SERVICE(8)
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