How to use uswsusp for suspend-then-hibernate with systemd?

Question

Configure suspend-then-hibernate to use uswsusp

I'm using uswsusp for suspend to RAM and suspend to disk (hibernate) via systemd. Therefore I've adjusted /etc/systemd/system/systemd-suspend.service.d/override.conf and /etc/systemd/system/systemd-hibernate.service.d/override.conf.

Suspend and hibernate works find using uswsusp. My problem is that systemd still uses the kernel's swsusp for suspend-then-hibernate. This, of course, results in a failure while restoring from hibernate because of the wrong mkinitcpio hook.

I assume that it is necessary to adjust the systemd configuration for suspend-then-hibernate (/etc/systemd/system/systemd-suspend-then-hibernate.service.d/override.conf) as well. But I've no idea what it must look like. Is it even possible or would it require uswsusp to support suspend-then-hibernate?

I'm on arch linux. This question is somehow related to this one.

/etc/systemd/system/systemd-suspend.service.d/override.conf:

[Service]
ExecStart=
ExecStartPre=-/usr/bin/run-parts -v -a pre /usr/lib/systemd/system-sleep
ExecStart=/usr/bin/s2ram
ExecStartPost=-/usr/bin/run-parts -v --reverse -a post /usr/lib/systemd/system-sleep

/etc/systemd/system/systemd-hibernate.service.d/override.conf:

[Service]
ExecStart=
ExecStartPre=-/usr/bin/run-parts -v -a pre /usr/lib/systemd/system-sleep
ExecStart=/usr/bin/s2disk
ExecStartPost=-/usr/bin/run-parts -v --reverse -a post /usr/lib/systemd/system-sleep

Answer 1

Inspired by @AdamLett's answer I implemented the following solution/workaround.

I edited the systemd-suspend-then-hibernate service to use a custom script I have created at /usr/local/bin/s2ram-then-s2disk.sh

#!/bin/bash
# Custom suspend-then-hibernate script using uswsusp.

# Edit the "HibernateDelaySec" variable below to set the number
# of seconds to remain in suspend before hibernate.
HibernateDelaySec=1200

curtime=$(date +%s)
lock=/tmp/rtchibernate.lock

# Suspending... Record current time and set a wake up timer.
echo "$curtime" > $lock
rtcwake -m no -s $HibernateDelaySec
s2ram

# The systen is now suspended.

# Coming out of sleep...
curtime=$(date +%s)
sustime=`cat $lock`
rm $lock

# Did we wake up due to the rtc timer above?
if [ $(($curtime - $sustime)) -ge $HibernateDelaySec ]; then
    # Hibernate (suspend to disk)...
    s2disk
else
    # Cancel the rtc timer and wake up normally.
    rtcwake -m disable
fi

/etc/systemd/system/systemd-suspend-then-hibernate.service.d/override.conf

[Service]
ExecStart=
ExecStartPre=-/usr/bin/run-parts -v -a pre /usr/lib/systemd/system-sleep
ExecStart=/usr/local/bin/s2ram-then-s2disk.sh
ExecStartPost=-/usr/bin/run-parts -v --reverse -a post /usr/lib/systemd/system-sleep

Answer 2

I was looking to do the same thing and got stuck at the same point as you and didn't know how to configure it. In the end I found a work-around which worked for me in the answer here: https://superuser.com/a/1153147

It doesn't use the actual systemd configuration for suspend-then-hibernate but instead uses a normal suspend but then runs a script after your chosen delay which wakes the system and puts it into hibernation

(Note that for me on Ubuntu 18.04 the correct path was /lib/systemd/system-sleep/ rather than /usr/lib/systemd/system-sleep/)

Answer 3

I ran into the answer for this, but don't have the URL (working on home system at the time). You need to add "-a hibernate" after the "-a pre" and "-a post" ExecStart lines. I also had to change the path for system-sleep since I am using Ubuntu as the previous post mentions.

Example:

[Service] 
ExecStart=
ExecStartPre=-/usr/bin/run-parts -v -a pre -a hibernate /lib/systemd/system-sleep
ExecStart=/usr/bin/s2disk
ExecStartPost=-/usr/bin/run-parts -v --reverse -a post -a hibernate /lib/systemd/system-sleep

Answer 4

Create the following systemd service for hybrid-sleep (suspend then hibernate).

File name: /etc/systemd/system/systemd-hybrid-sleep.service.d/override.conf

[Service] 
ExecStart=
ExecStartPre=-/usr/bin/run-parts -v -a pre -a hybrid-sleep /lib/systemd/system-sleep
ExecStart=/usr/bin/s2both
ExecStartPost=-/usr/bin/run-parts -v --reverse -a post -a hybrid-sleep /lib/systemd/system-sleep

[Edit: Note use of -a hybrid-sleep and s2both.]

I added this on my system last night and left my machine in this state as a test. A short test proved that suspend worked, but I wanted to let my battery drain to test the restore from hibernate tonight.