# elementaty_os

Lid Hibernate Ubuntu
Make sure you have SWAP > RAM
SWAP to fstab
find swap UUID:

blkid | grep swap
should output

/dev/nvme0n1p1: UUID="90ee7315-b16a-4e2g-bd07-cg83703750b9" TYPE="swap" PARTUUID="abadca41-942a-6c83-88d2-db28cf41ce13"`
copy the UUID, without the " :

UUID=90ee7315-b16a-4e2g-bd07-cg83703750b9

add swap to fstab

sudo nano /etc/fstab
add

UUID=90ee7315-b16a-4e2g-bd07-cg83703750b9 none            swap    sw              0       0 

reboot
add swap to grub
sudo nano /etc/default/grub
edit GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" to GRUB_CMDLINE_LINUX_DEFAULT="resume=UUID=90ee7215-c16a-4e2f-bd07-cd83703750b6" 

if you DONT want kernel messages to be shown and keep the plymouth animation during boot, change to:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash resume=UUID=90ee7215-c16a-4e2f-bd07-cd83703750b6"
update grub with the new settings: sudo update-grub

try with

sudo systemctl hibernate
after reboot it should show all the same windows again

activate automatic hibernation after delay
To start using this function you need to create a file

sudo nano /etc/systemd/sleep.conf
add

[Sleep]
HibernateDelaySec=3600
try

sudo systemctl suspend-then-hibernate
Should sleep for the time specified and then the screen turns on shortly and it hibernates. Try rebooting after this happened.

If it works make it permanent.

sudo nano /etc/systemd/logind.conf
change

#HandleSuspendKey=suspend
#HandleLidSwitch=suspend
to

HandleSuspendKey=suspend-then-hibernate
HandleLidSwitch=suspend-then-hibernate
Save the file. Restart logind service by the command:

systemctl restart systemd-logind.service