Manual: systemd-hibernate-resume.service

SYSTEMD-HIBERNATE-RESUME.SERVICE(8)	      systemd-hibernate-resume.service		 SYSTEMD-HIBERNATE-RESUME.SERVICE(8)

NAME
       systemd-hibernate-resume.service, systemd-hibernate-clear.service, systemd-hibernate-resume - Resume from hibernation

SYNOPSIS
       systemd-hibernate-resume.service

       systemd-hibernate-clear.service

       /usr/lib/systemd/systemd-hibernate-resume

DESCRIPTION
       systemd-hibernate-resume.service initiates the resume from hibernation.

       systemd-hibernate-resume only supports the in-kernel hibernation implementation, see Swap suspend[1]. Internally, it
       works by writing the major:minor of selected device node to /sys/power/resume, along with the offset in memory pages
       (/sys/power/resume_offset) if supported.

       The resume device node is either passed directly through arguments, or automatically acquired from kernel command
       line options and/or HibernateLocation EFI variable. The latter will normally be cleared by
       systemd-hibernate-resume.service on resumption. If a stale variable is detected, it would be cleared by
       systemd-hibernate-clear.service.

       Failing to initiate a resume is not an error condition. It may mean that there was no resume image (e. g. if the
       system has been simply powered off and not hibernated). In such cases, the boot is ordinarily continued.

SEE ALSO
       systemd(1), systemd-hibernate-resume-generator(8)

NOTES
	1. Swap suspend
	   https://docs.kernel.org/power/swsusp.html

systemd 259.5										 SYSTEMD-HIBERNATE-RESUME.SERVICE(8)