How to enable hibernation with refind boot manager

Issues & Assistance
1

I’ve successfully installed Cachy OS, the first time I try a arch based distro.

The only remaining issue to solve is how to hibernate.
I’ve researched a little before asking.

I’m using refind boot manager.
My setup is:

  • a partition for /boot/efi
  • another one for /boot
  • another one for swap, it has the same size as physical RAM.
  • the root partition: LUKS + btrfs. It is ciphered.

I don’t know how to specify the resume hook to initramfs.

Is it easy to change boot manager without reinstalling everything?

2

You do not need to switch boot managers to unlock resume functionality. It is boot manager agnostic. See Power management/Suspend and hibernate - ArchWiki

3

OK, with GRUB I know how to activate hibernation and with systemd boot, but don’t find how to do it with refind.

4

If you mean adding the kernel cmdline to the boot options, refer to Boot Manager Configuration | CachyOS.

2 Likes
5

Thanks to your answer it’s been easy.

1 Like
6

could you eventually help me on this one, I have similar setup. Except I want to swap into file, instead of a swap partition. Is it even possible with zram? Some say yes, some nope. So idk, and I did not manage to make it work.

Getting this response…

sudo systemctl hibernate
Call to Hibernate failed: Not enough suitable swap space for hibernation available on compatible block devices and file systems

Despite having free space available:

free
               total        used        free      shared  buff/cache   available
Mem:        65152244     5042780    58679440      198608     2245776    60109464
Swap:       70254588           0    70254588
7

A year ago with Pop OS! based on Ubuntu 22.04, I wasn’t able to hibernate to file inside an encrypted btrfs partitiion. With a separated swap partition, hibernation ran smoothly.

How much RAM do you have?
Swap file size should about the same size than phisIcal RAm.

1 Like
8

@xetra have a look what Archwikisites @naim did link

1 Like
9

Thank you @hotte, I did for multiple hours, and I dont understand it. So confusing to me.

10

I have around 2 gigs more than RAM.

Mem:        65152244 
Swap:       70254588

❯ zramctl 
NAME       ALGORITHM DISKSIZE DATA COMPR TOTAL STREAMS MOUNTPOINT
/dev/zram0 zstd           67G   4K   62B   20K      16 [SWAP]

❯ swapon --show
NAME       TYPE      SIZE USED PRIO
/dev/zram0 partition  67G   0B  100

❯ systemctl hibernate 
Call to Hibernate failed: Not enough suitable swap space for hibernation available on compatible block devices and file systems
11

@xetra
hi mate, what is your intention, what do you want to realize ?
you write

I want to swap into file, instead of a swap partition.

on cachyOS that’s by default zram
to see it, just run swapon -s
also have a look here
and here

but if you want to hibernate, a swap partition is required normally

12

Thanks for reply :slight_smile:

Yes, I want to hibernate. So its not possible to make hibernation work with swap file, only with swap partition?

13

guess that’s reality

1 Like
14

Thx my friend, gonna make a swap partition then :upside_down_face:

1 Like
15

I have not tried it yet but there is no reason why a swap file should not work with zram.

  1. See Power management/Suspend and hibernate - ArchWiki
    According to GitHub - gissf1/zram-hibernate: Allows dynamic swap changes to activate disk-based storage as swap for hibernation support when a system typically uses only zram swap during normal operation. it is complicated, but that git might not be up-to-date.
  2. Adding a swap file in btrfs takes some additional steps, see
    Swapfile — BTRFS documentation
    swap - Can I have a swapfile on btrfs? - Ask Ubuntu
    Wie erstelle ich ein /swap subvolume nachträglich in Btrfs? - #7 by dalto - EOS Deutsch - EndeavourOS
  3. If it really doesn’t work with zram, switching to zswap is another option
16

Also consider that zram is a compressed space that is set to use the whole ram. zram compresses by a higher ration then lzo / lz4 and the ratio can go up to 5 (Zram - LinuxReviews). You need to allocate enough space for your swap partition/file.
Further Reading: Power management/Suspend and hibernate - ArchWiki