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Frank Barcenas
Asked: 2021-08-17 14:54:30 +0800 CST

How could I enable hibernation on a Dell Inspiron 5548 running ubuntu focal?

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I'm running Ubuntu Focal and I have 15gigs of Ram and 20G of swap space.

Partition: ID-1: / size: 437.52 GiB used: 47.14 GiB (10.8%) fs: ext4 dev: /dev/sda5 
       ID-2: swap-1 size: 19.53 GiB used: 0 KiB (0.0%) fs: swap dev: /dev/sda6

I've tried adding acpi=noirq to my grub boot options but it didn't work and it ended up disabling my keyboard.

When I type sudo pm-hibernate and turn the computer back on it starts up normally.

Is there something else I could try?

hibernate

1 Answers

  1. Best Answer

    To enable Hibernation in 20.04 using swapfile:

    Confirm swapfile size matches RAM size

    • Check the swap that is in use:

      sudo swapon -s

    • If swap partition(s) are found:

      sudo swapoff -a
sudo nano -Bw /etc/fstab

    • Add # before the UUID of the swap partition(s):

      # UUID=XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX   none   swap    sw     0       0

    • Add a line for the swapfile, if one does not exist:

      /swapfile   none    swap     sw      0       0

    • Create the swapfile:

      sudo fallocate -l XG /swapfile*

      where X is swapfile's size in GB:

      sudo mkswap /swapfile
sudo chmod 0600 /swapfile
sudo swapon /swapfile

    • Reboot:

      sudo reboot

    Add resume location and offset to grub.cfg:

    • Edit /etc/default/grub:

      GRUB_CMDLINE_LINUX_DEFAULT="quiet splash resume=UUID=XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX resume_offset=XXXXX"

    • Use UUID from root.

    • Use offset from:

      sudo filefrag -v /swapfile |grep " 0:"| awk '{print $4}'

    • Update GRUB:

      sudo update-grub

    • Test hibernation:

      sudo systemctl hibernate

    A hibernate button can be added using GNOME extensions.

    Note that there is a slight possibility of getting holes in a swapfile when creating it with fallocate. /var/log/syslog can be searched for the phrase swapon: swapfile has holes to ensure there will be no data loss.

    A swap file can alternatively be created using dd:

    sudo dd if=/dev/zero of=/swapfile bs=1G count=8

    An error when using dd may overwrite your HDD.

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