How to enable hibernation on Arch Linux.

  • Laptop: ASUS X102BA
  • Dual boot: Arch Linux LTS and Windows 8

Create a swap file

  1. Check total memory size.

    $ free -h
              total        used        free      shared  buff/cache   available
Mem:          2.4Gi       619Mi       590Mi       2.0Mi       1.2Gi       1.6Gi
Swap:            0B          0B          0B

  2. Create a swap file.

    $ fallocate -l 2.4G /swapfile
$ chmod 600 /swapfile
$ mkswap /swapfile
Setting up swapspace version 1, size = 2.4 GiB (2566909952 bytes)
no label, UUID=78f84de2-2a78-4922-9ee7-5b0d7bedc590

  3. Enable swap.

    $ swapon /swapfile
$ swapon -s
Filename	Type	Size	Used	Priority
/swapfile	file	2506748	0	-2
$ free -b
              total        used        free      shared  buff/cache   available
Mem:          2.4Gi       622Mi       586Mi       2.0Mi       1.2Gi       1.6Gi
Swap:         2.4Gi          0B       2.4Gi

  4. Update /etc/fstab.

    /dev/sda5	/	ext4	rw,relatime,data=ordered	0 1
/swapfile	none	swap	defaults			0 0

Enable hibernation

  1. Check the swap file offset.

    $ filefrag -v /swapfile
Filesystem type is: ef53
File size of /swapfile is 2566914048 (626688 blocks of 4096 bytes)
 ext:     logical_offset:        physical_offset: length:   expected: flags:
   0:        0..       0:   13469696..  13469696:      1:            
   1:        1..   14335:   13469697..  13484031:  14335:             unwritten
   2:    14336..   16383:   13486080..  13488127:   2048:   13484032: unwritten
(more lines...)

  2. Add kernel parameters to /etc/default/grub file.

    GRUB_CMDLINE_LINUX_DEFAULT="quiet resume=UUID=b196ea21-0496-4ff9-a7b2-97bee7bb1cd0 resume_offset=13469696"

  3. Regenerate /boot/grub/grub.cfg file with above kernel parameters.

    $ os-prober
/dev/sda1@/efi/Microsoft/Boot/bootmgfw.efi:Windows Boot Manager:Windows:efi
$ grub-mkconfig -o /boot/grub/grub.cfg
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-linux-lts
Found initrd image: /boot/initramfs-linux-lts.img
Found fallback initrd image(s) in /boot: initramfs-linux-lts-fallback.img
Found linux image: /boot/vmlinuz-linux
Found initrd image: /boot/initramfs-linux.img
Found fallback initrd image(s) in /boot: initramfs-linux-fallback.img
Found Windows Boot Manager on /dev/sda1@/efi/Microsoft/Boot/bootmgfw.efi
done

  4. Add “resume” after udev in /etc/mkinitcpio.conf file.

    HOOKS=(base udev resume autodetect modconf block filesystems keyboard fsck)

  5. Regenerate the initramfs.

    $ mkinitcpio -p linux-lts

  6. Test hibernation after reboot.

    $ systemctl hibernate

Notes

  • systemd-swap didn’t work because hibernation needs a persistent fs blocks.