FirefoxSidebar/hibernation.md

Hibernation

A few things I've discovered for hibernation, mainly in Ubuntu 20.04/10+(?).

Enable hibernation, swap to disk (not partition)

Here is what I did to make it work with Ubuntu 18.04.

• Make your /swapfile have at least the size of your RAM

sudo swapoff /swapfile
sudo dd if=/dev/zero of=/swapfile bs=$(cat /proc/meminfo | awk '/MemTotal/ {print $2}') count=1024 conv=notrunc
sudo mkswap /swapfile
sudo swapon /swapfile

• Note the UUID of the partition containing your /swapfile:

$ sudo findmnt -no UUID -T /swapfile
20562a02-cfa6-42e0-bb9f-5e936ea763d0

• Reconfigure the package uswsusp in order to correctly use the swapfile:

sudo dpkg-reconfigure -pmedium uswsusp
# Answer "Yes" to continue without swap space
# Select "/dev/disk/by-uuid/20562a02-cfa6-42e0-bb9f-5e936ea763d0" replace the UUID with the result from the previous findmnt command
# Encrypt: "No"

• Edit the SystemD hibernate service using sudo systemctl edit systemd-hibernate.service and fill it with the following content:

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

• Note the resume offset of your /swapfile:

$ sudo swap-offset /swapfile
resume offset = 34818

• Configure Grub to resume from the swapfile by editing /etc/default/grub and modify the following line:

GRUB_CMDLINE_LINUX_DEFAULT="resume=UUID=20562a02-cfa6-42e0-bb9f-5e936ea763d0 resume_offset=34818 quiet splash"

• Update Grub:

sudo update-grub

• Create the following /etc/initramfs-tools/conf.d/resume:

RESUME=UUID=20562a02-cfa6-42e0-bb9e-5e936ea763d0 resume_offset=34816
    # Resume from /swapfile

• Update initramfs:

sudo update-initramfs -u -k all

Now you can hibernate with sudo systemctl hibernate.

One can also create those scripts:

sudo tee /usr/local/bin/gotosleep <<EOF
dbus-send --type=method_call --dest=org.gnome.ScreenSaver /org/gnome/ScreenSaver org.gnome.ScreenSaver.Lock
sleep 2
sudo /usr/sbin/s2both
EOF
sudo chmod +x /usr/local/bin/gotosleep
sudo tee /usr/local/bin/gotohibernation <<EOF
dbus-send --type=method_call --dest=org.gnome.ScreenSaver /org/gnome/ScreenSaver org.gnome.ScreenSaver.Lock
sleep 2
sudo systemctl hibernate
EOF
sudo chmod +x /usr/local/bin/gotohibernation

So you can sleep with gotosleep or hibernate with gotohibernation.

You must be able to execute sudo s2both, sudo s2ram and sudo systemctl hibernatewithout having to enter your password for the previous scripts to work.

You could do that for example by creating a powerdev group, add your current user to it, and configure the following sudoers config (edit it with sudo visudo -f /etc/sudoers.d/powerdev):

%powerdev ALL=NOPASSWD: /usr/sbin/s2both, /usr/sbin/s2ram, /bin/systemctl hibernate

Documentation used:

• Cas' answer
• Debian "Hibernate without swap partition"
• Configuring Lubuntu 18.04 to enable hibernation using a swap file
• So question "s2disk works, but hibernation from menu gets stuck afer login"

Enable suspend then hibernate

This enables ubuntu/linux to suspend then after a set amount of time hibernaate

To start using this function (suspend-then-hibernate) you need to create a file /etc/systemd/sleep.conf with the next content:

[Sleep]
HibernateDelaySec=3600

Then you can test it by command:

sudo systemctl suspend-then-hibernate

you can edit HibernateDelaySec to reduce delay to hibernate.

If all works fine you can change Lid Close Action, to do it you need to edit the file /etc/systemd/logind.conf

You need to find option HandleLidSwitch=, uncomment it and change to HandleLidSwitch=suspend-then-hibernate. Then you need to restart systemd-logind service (warning! you user session will be restarted) by the next command:

sudo systemctl restart systemd-logind.service

That's all! Now you can use this nice function. (via StackOverflow)