[Bug 1876570] Re: Could not resume from hibernation when swap is specified as device

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: initramfs-tools (Ubuntu)
       Status: New => Confirmed

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Title:
  Could not resume from hibernation when swap is specified as device

Status in initramfs-tools package in Ubuntu:
  Confirmed

Bug description:
  I originally experienced this on Pop!_OS but I have reproduced it on a
  freshly installed Ubuntu.

  1. Ubuntu 20.04 LTS
  2. initramfs-tools-core 0.136ubuntu6
  3. I expect the system to resume from hibernation when running pm_hibernate
  4. The system starts up anew when I try to resume

  I have setup a swap partition on /dev/vda2 in /etc/fstab. To enable
  hibernate I added the kernel parameter "resume=/dev/vda2" to
  GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub and run update-grub.

  From debugging initramfs it tries to follow a symbolic link

  DEV=$(readlink "$resume")
  (see /usr/share/initramfs-tools/scripts/local-premount/resume, line 35)

  which works well when swap is specified with uuid. When swap is
  specified as a device directly the readlink returns an empty string
  and the system does not resume from hibernation.

  To verify this I added the parameter -f to readlink and run "update-
  initramfs -u". The system now hibernates successfully.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: initramfs-tools 0.136ubuntu6
  ProcVersionSignature: Ubuntu 5.4.0-28.32-generic 5.4.30
  Uname: Linux 5.4.0-28-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Sun May  3 13:26:02 2020
  InstallationDate: Installed on 2020-05-03 (0 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  PackageArchitecture: all
  SourcePackage: initramfs-tools
  UpgradeStatus: No upgrade log present (probably fresh install)

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