# Is it possible to hibernate with swap-file?

**URL:** https://discourse.nixos.org/t/is-it-possible-to-hibernate-with-swap-file/2852
**Category:** Help
**Created:** [May 5, 2019, 5:27pm UTC](https://discourse.nixos.org/t/is-it-possible-to-hibernate-with-swap-file/2852 "2019-05-05T17:27:19Z")
**Posts on this page:** 1
**Showing post:** 3

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### Author: ![balint](https://discourse.nixos.org/user_avatar/discourse.nixos.org/balint/32/15960_2.png) [@balint](https://discourse.nixos.org/u/balint)
#### Post date: [March 3, 2024, 10:12pm UTC](https://discourse.nixos.org/t/is-it-possible-to-hibernate-with-swap-file/2852/3 "2024-03-03T22:12:25Z")

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Hi everyone

I got it to work with a complex setup so I thought I would leave this here for the future generations.

My setup is Btrfs + LUKS2 + TPM unlock + swapfile. Long story short, I got to this setup by doing the recommended auto partitioning during the install, then a long time later I changed things up. I used a live USB NixOS, removed my swap partition and filled the space with the root partition in gparted (leaving a few megabytes at the end empty). I followed a guide to convert from ext4 to btrfs and another guide to upgrade to LUKS2 from the default LUKS1 and also switched to a stronger key algo there. The TPM enrolling is pretty simple too.

[Btrfs convert guide](https://archive.kernel.org/oldwiki/btrfs.wiki.kernel.org/index.php/Conversion_from_Ext3/4_and_ReiserFS.html)  
[Luks upgrade guide](https://gist.github.com/Edu4rdSHL/8f97eb1bab454fb2b348f1167cee7cd2)  
[TPM enroll guide](https://discourse.nixos.org/t/full-disk-encryption-tpm2/29454)

I only have 2 partitions, the boot and the root. During the boot sequence the encrypted root volume gets automatically unlocked using the TPM and mapped to /dev/dm-0. I found this with `ll /dev/mapper/luks*`

I have an 18G swapfile at /var/swapfile. It’s auto created by my NixOS config.  
I used `btrfs inspect-internal map-swapfile -r /var/swapfile` to get the resume offset for the kernel parameter.

Here’s my config:

```auto
  swapDevices = [{ device = "/var/swapfile"; size = 18*1024; }];
  boot.resumeDevice = "/dev/dm-0"; # the unlocked drive mapping
  boot.kernelParams = [
    "resume_offset=10134041"
  ];

```

After building and rebooting I can finally hibernate with `systemctl hibernate` and my PC wakes up from keyboard or mouse input.

I still don’t know how to add a hibernate button to the shutdown menu and disable the wake from mouse/keyboard but it’s good progress for day.  
I’m planning to try [Suspend then hibernate - #5 by ericgundrum](https://discourse.nixos.org/t/suspend-then-hibernate/31953/5) next

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