systemd-hibernate-resume@.service initiates the resume from
hibernation. It is instantiated with the device to resume from as the
systemd-hibernate-resume only supports the in-kernel hibernation
implementation, known as swsusp. Internally, it works by writing the
major:minor of specified device node to /sys/power/resume.
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 case, the boot is ordinarily
systemd 229 SYSTEMD-HIBERNATE-RESUME@.SERVICE(8)
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