right fit swap for laptop hibernation - Ubuntu 20.04 full ZFS install

sources

prerequisite

This setup is based on an almost full ZFS install see : Unbuntu-20.04-encrypt-ZFS-install
bios setup : You have to disable secure boot in bios to permit Hibernate because of kernel lockdown prevent hibernation see link : stackexchange - Why does the kernel lockdown prevent hibernation?

create swap partition to permit Hibernate

With default Ubuntu zsys-setup full ZFS install swap will have 2GB wich is maybe not enough for your systeme. We have to create a swap partition with a size which fit RAM size for hibernation.

add theses 2 lines in : /usr/share/ubiquity/zsys-setup

MEMSIZE=$(cat /proc/meminfo | grep MemTotal | awk -F' ' '{print $2}')
SWAPVOLSIZE=$(( MEMSIZE / 1024 ))

like bellow :

    # Convert to MiB to align the size on the size of a block
	SWAPVOLSIZE=$(( SWAPSIZE / 1024 / 1024 ))
    
MEMSIZE=$(cat /proc/meminfo | grep MemTotal | awk -F' ' '{print $2}')
SWAPVOLSIZE=$(( MEMSIZE / 1024 ))

	prepare_target "${TARGET}"
	format_disk "${DISK}" "${PARTBASE}" "${PARTESP}" "${PARTBPOOL}" "${PARTRPOOL}" "${SWAPVOLSIZE}"
	init_zfs "${TARGET}" "${DISK}${PARTBASE}${PARTBPOOL}" "${DISK}${PARTBASE}${PARTRPOOL}"
	init_system_partitions "${TARGET}" "${DISK}${PARTBASE}1" "${DISK}${PARTBASE}${PARTESP}"

Run ubiquity to start the installer and install as normal, selecting “Use entire disk” and the option to use ZFS.

activate hibernation in system

Disable secure boot in bios to permit Hibernate.

apt install pm-utils

printf "RESUME=UUID=$(blkid | awk -F\" '/swap/ {print $2}')\n" | head -n 1| sudo tee /etc/initramfs-tools/conf.d/resume

you can check with : blkid

update-initramfs -u -k all

change /etc/default/grub : add your resume UUID into GRUB_CMDLINE_LINUX_DEFAULT

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash resume=UUID=75034ff5-...-9e4564e16d34"

Edit file : /etc/polkit-1/localauthority/50-local.d/com.ubuntu.enable-hibernate.pkla

[Réactive hiberner par défaut dans upower]
Identity=unix-user:*
Action=org.freedesktop.upower.hibernate
ResultActive=yes

[Réactive hiberner par défaut dans logind]
Identity=unix-user:*
Action=org.freedesktop.login1.hibernate;org.freedesktop.login1.handle-hibernate-key;org.freedesktop.login1;org.freedesktop.login1.hibernate-multiple-sessions;org.freedesktop.login1.hibernate-ignore-inhibit
ResultActive=yes

configure hibernate to auto switch from sleep to hibernate

source : Linux Mint Forums : Enable Hibernation with LUKS on LVM and extras

edit : /etc/systemd/sleep.conf

And add this value to it (The number represents seconds you want to pass in sleep, after which the computer will switch to hibernation, so you can put it in 60 seconds or something short just to check it's working and after that you can put whatever ammount of time you want):

[Sleep]
HibernateDelaySec=1200

Here I choose 1200 for 20min, I think that I can move from one place to an other in less than 20min if it's more systeme goes to hibernate mode.

Modify this two lines in /etc/systemd/logind.conf for sleep key and closing the lid actions if that's how you want it:

HandleSuspendKey=suspend-then-hibernate
HandleLidSwitch=suspend-then-hibernate

xfce4-power-manager suspend to hibernate option

source : docs.xfce.org - Frequently Asked Questions - Xfce4 Power Manager

Because it's not possible to configure suspend-then-hibernate for Lid close inside XFCE Power Manager Control Panel, you will make logind handle button events instead of xfce4-power-manager.

To have logind handle the lid open/close event, has your normal user do this in a terminal :

xfconf-query -c xfce4-power-manager -p /xfce4-power-manager/logind-handle-lid-switch -n -t bool -s true

Be carrefull this setup may be remove if you do some modification in Control Panel.

If you want everything time related, then you can set them with settings in /etc/systemd : sleep.conf and logind.conf

What is our suspend Hibernate comportement with above configuration

if system is running, and you close lid, it will suspend to RAM then 20min lather il will Hibernate
If you push Power Button, it will ask you what you want to do
You can confgure xfce4-power-manager to Hibernate if battery goes under a %

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