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# 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 hibernate`without 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](https://askubuntu.com/a/892410/29219)
- [Debian "Hibernate without swap partition"](https://wiki.debian.org/Hibernation/Hibernate_Without_Swap_Partition)
- [Configuring Lubuntu 18.04 to enable hibernation using a swap file](https://fitzcarraldoblog.wordpress.com/2018/07/14/configuring-lubuntu-18-04-to-enable-hibernation-using-a-swap-file/)
- [So question "s2disk works, but hibernation from menu gets stuck afer login"](https://askubuntu.com/q/1035345/29219)
## 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](https://askubuntu.com/questions/12383/how-to-go-automatically-from-suspend-into-hibernate))