systemd-suspend.service(8) System sleep state logic

Other Alias

systemd-hibernate.service, systemd-hybrid-sleep.service, systemd-sleep







systemd-suspend.service is a system service that is pulled in by and is responsible for the actual system suspend. Similarly, systemd-hibernate.service is pulled in by to execute the actual hibernation. Finally, systemd-hybrid-sleep.service is pulled in by 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-sleep.conf(5).


systemd-sleep understands the following commands:

-h, --help

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.