forked from CaptaiNiveau/FirefoxSidebar
134 lines
4.4 KiB
Markdown
134 lines
4.4 KiB
Markdown
# Hibernation
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A few things I've discovered for hibernation, mainly in Ubuntu 20.04/10+(?).
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## Enable hibernation, swap to disk (not partition)
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Here is what I did to make it work with Ubuntu 18.04.
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- Make your `/swapfile` have at least the size of your RAM
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```
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sudo swapoff /swapfile
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sudo dd if=/dev/zero of=/swapfile bs=$(cat /proc/meminfo | awk '/MemTotal/ {print $2}') count=1024 conv=notrunc
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sudo mkswap /swapfile
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sudo swapon /swapfile
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```
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- Note the UUID of the partition containing your `/swapfile`:
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```
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$ sudo findmnt -no UUID -T /swapfile
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20562a02-cfa6-42e0-bb9f-5e936ea763d0
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```
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- Reconfigure the package `uswsusp` in order to correctly use the swapfile:
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```
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sudo dpkg-reconfigure -pmedium uswsusp
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# Answer "Yes" to continue without swap space
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# Select "/dev/disk/by-uuid/20562a02-cfa6-42e0-bb9f-5e936ea763d0" replace the UUID with the result from the previous findmnt command
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# Encrypt: "No"
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```
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- Edit the SystemD hibernate service using `sudo systemctl edit systemd-hibernate.service` and fill it with the following content:
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```
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[Service]
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ExecStart=
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ExecStartPre=-/bin/run-parts -v -a pre /lib/systemd/system-sleep
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ExecStart=/usr/sbin/s2disk
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ExecStartPost=-/bin/run-parts -v --reverse -a post /lib/systemd/system-sleep
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```
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- Note the resume offset of your `/swapfile`:
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```
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$ sudo swap-offset /swapfile
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resume offset = 34818
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```
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- Configure Grub to resume from the swapfile by editing `/etc/default/grub` and modify the following line:
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```
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GRUB_CMDLINE_LINUX_DEFAULT="resume=UUID=20562a02-cfa6-42e0-bb9f-5e936ea763d0 resume_offset=34818 quiet splash"
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```
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- Update Grub:
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```
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sudo update-grub
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```
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- Create the following `/etc/initramfs-tools/conf.d/resume`:
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```
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RESUME=UUID=20562a02-cfa6-42e0-bb9e-5e936ea763d0 resume_offset=34816
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# Resume from /swapfile
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```
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- Update initramfs:
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```
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sudo update-initramfs -u -k all
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```
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Now you can hibernate with `sudo systemctl hibernate`.
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One can also create those scripts:
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```
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sudo tee /usr/local/bin/gotosleep <<EOF
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dbus-send --type=method_call --dest=org.gnome.ScreenSaver /org/gnome/ScreenSaver org.gnome.ScreenSaver.Lock
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sleep 2
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sudo /usr/sbin/s2both
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EOF
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sudo chmod +x /usr/local/bin/gotosleep
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sudo tee /usr/local/bin/gotohibernation <<EOF
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dbus-send --type=method_call --dest=org.gnome.ScreenSaver /org/gnome/ScreenSaver org.gnome.ScreenSaver.Lock
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sleep 2
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sudo systemctl hibernate
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EOF
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sudo chmod +x /usr/local/bin/gotohibernation
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```
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So you can sleep with `gotosleep` or hibernate with `gotohibernation`.
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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.
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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`):
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```
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%powerdev ALL=NOPASSWD: /usr/sbin/s2both, /usr/sbin/s2ram, /bin/systemctl hibernate
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```
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Documentation used:
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- [Cas' answer](https://askubuntu.com/a/892410/29219)
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- [Debian "Hibernate without swap partition"](https://wiki.debian.org/Hibernation/Hibernate_Without_Swap_Partition)
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- [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/)
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- [So question "s2disk works, but hibernation from menu gets stuck afer login"](https://askubuntu.com/q/1035345/29219)
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## Enable suspend then hibernate
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This enables ubuntu/linux to suspend then after a set amount of time hibernaate
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To start using this function (suspend-then-hibernate) you need to create a file ```/etc/systemd/sleep.conf``` with the next content:
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```
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[Sleep]
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HibernateDelaySec=3600
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```
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Then you can test it by command:
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```sudo systemctl suspend-then-hibernate```
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you can edit ```HibernateDelaySec``` to reduce delay to hibernate.
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If all works fine you can change Lid Close Action, to do it you need to edit the file ```/etc/systemd/logind.conf```
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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:
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```sudo systemctl restart systemd-logind.service```
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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))
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