SYSTEMD-....SERVICE(8) systemd-hibernate-resume.service SYSTEMD-....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 257.9 SYSTEMD-....SERVICE(8)
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