Laptop doesn't resume from hibernation

From a fresh install using an ext4 encrypted fs including 16.5gb encrypted swap partition my system never resumes from hibernation, boots up as if I’ve done a restart/shutdown with all app state/data lost. I’ve got 16gb ram.

While resuming/booting it mentions openswap has failed, but I can’t find a mention of this using dmesg or journalctl.

While hibernating

Sep 09 10:12:21 inspiron-14-5425 systemd[1]: Starting Hibernate...
Sep 09 10:12:21 inspiron-14-5425 kernel: PM: Image not found (code -16)
Sep 09 10:12:21 inspiron-14-5425 systemd-sleep[300144]: Entering sleep state 'hibernate'...
Sep 09 10:12:21 inspiron-14-5425 kernel: PM: hibernation: hibernation entry

I don’t know if kernel: PM: Image not found (code -16) is an issue?

swapon -v
/dev/dm-1 partition 16.5G   0B   -2
cat /proc/swaps

Filename                Type        Size        Used        Priority
/dev/dm-1               partition   17353728    0       -2
cat /proc/cmdline

BOOT_IMAGE=/boot/vmlinuz-linux root=UUID=2f42a0e3-affa-4b4e-8387-09e46b6a5650 rw cryptdevice=UUID=de401af2-7847-4411-a933-4a31273ce6e8:luks-de401af2-7847-4411-a933-4a31273ce6e8 root=/dev/mapper/luks-de401af2-7847-4411-a933-4a31273ce6e8 resume=/dev/mapper/luks-452feb95-f3a5-4724-9a44-1564feba49e7 loglevel=3 nowatchdog nvme_load=YES

cat /etc/mkinitcpio.conf

HOOKS="base udev autodetect modconf block keyboard keymap consolefont encrypt openswap resume filesystems fsck"
cat /etc/fstab

/dev/mapper/luks-452feb95-f3a5-4724-9a44-1564feba49e7 swap           swap    defaults   0 0

/etc/openswap.conf is empty

I’ve never seen any usage of my swap partition. Where do I go from here?

Felt a bit like I was banging my head against a wall here trying to get hibernation working with a separate encrypted swap partition. Decided to nuke the FS and instead use one encrypted ext4 partition and a swap file.

Hibernation didn’t work out the box on a fresh eOS install which I thought was a shame, but I followed the guide here and got it working easily enough

What is your question?

Or is it just a rant?

It’s been a long since I setup hibernation manually - but the last time I did, I followed this guide. Maybe it helps. Maybe it’s trash. Sorry, and good luck.