[GUIDE] How to fix Suspend / Hibernate on Nvidia GPU

Hello Folks !
in this guide I will discuss how to fix suspend / hibernate on Nvidia GPU

## Step 1:

The script /usr/lib/elogind/system-sleep/nvidia has broken switch case

case "$1" in
    post)
        /usr/bin/nvidia-sleep.sh "resume"
        ;;
esac

which should be edited to be

case "$1" in
pre)
/usr/bin/nvidia-sleep.sh "suspend"
;;
    post)
        /usr/bin/nvidia-sleep.sh "resume"
        ;;
esac

## Step 2:

in /etc/default/grub, add resume=/dev/nvmeXXXX (change XXXX to whatever your swap partition is), in my case it was:

GRUB_CMDLINE_LINUX_DEFAULT="loglevel=3 quiet pci=noaer resume=/dev/nvme0n1p3"

## Step 3:

We should edit the file /sys/power/resume to include our swap partition offsets as following:

https://preview.redd.it/4p7h367fim5g1.png?width=560&format=png&auto=webp&s=2fc083e560ca2aff29108ac6d24134f5a441ef9f

but, this file resets after every boot, so we should write on it every boot, this can be done by creating /etc/tmpfiles.d/hibernation_resume.conf to include:

#  Path                Mode UID GID Age Argument
w /sys/power/resume    -    -   -   -   259:3

Change argument based on the MAJ:MIN we got from previous step :D

## Step 4:

It is time to include resume hook in /etc/mkinitcpio.conf:

HOOKS=(base udev autodetect microcode modconf kms keyboard keymap consolefont block filesystems resume fsck)

## Step 5:

For nvme to load the resume kernel parameter, we should early load the nvme module, so in /etc/mkinitcpio.conf

MODULES=(nvme)

## Step 6:

build initramfs and regenerate grub config:

sudo mkinitcpio -P
sudo grub-mkconfig -o /boot/grub/grub.cfg

## Step 7:

Reboot your device and enjoy working suspend and hibernate :D