[Bug 2061311] Re: dev's major/minor not captured in /sys/power/resume

[monochromec]

Swap file is the primary and only option  for hibernation as partition
is too small.

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Title:
  dev's major/minor not captured in /sys/power/resume

Status in systemd package in Ubuntu:
  New

Bug description:
  When trying to configure hibernation on Noble Numbat, systemd-sleep hibernate complains about
  "Failed to find location to hibernate to: Invalid argument" caused by a "0:0" entry in /sys/power/resume

  Current configuration:

  1) Legacy boot configuration (non-UEFI!)

  2) Dual swap space configuration (/etc/fstab excerpt for swap partition and file):
  UUID=c323a060-1b69-48af-a5bb-395f5d05fb60 none            swap    sw              0       0
  /swap                                     none            swap    sw,pri=2        0       0

  2) resume config in /etc/initramfs-tools/conf.d/resume with the
  correct UUID and offset:

  RESUME=UUID=7799882e-189c-484b-b9d4-f9e302859b0b
  resume_offset=39608320

  (blkid: /dev/sda1: UUID="7799882e-189c-484b-b9d4-f9e302859b0b"
  BLOCK_SIZE="4096" TYPE="ext4" PARTUUID="4f6b947f-01")

  3) Correct grub config:

  GRUB_CMDLINE_LINUX="resume=UUID=7799882e-189c-484b-b9d4-f9e302859b0b
  resume_offset=39608320 acpi_enforce_resources=lax"

  Suspect a regression issue with systemd-255 as the issue did *not*
  appear with Focal Fossal (system-245) and only surfaced after the
  upgrade to 24.04.

  Work-around:

  Amend /etc/rc.local (if this is enabled via systemd) with:

  "lsblk | fgrep <insert device path holding the swap file> | cut -d' '
  -f4 >/sys/power/resume"

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