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