# by device node -- does work
jb@guixrules ~$ sudo loginctl hibernate
jb@guixrules ~$ cat /proc/cmdline 
BOOT_IMAGE=/gnu/store/bkpkbms3mp8s45kpir4f2cnvxvgdvssp-linux-libre-5.4.39/bzImage --root=ed73cc09-aff3-41e4-90b6-51fb41a7d225 --system=/gnu/store/xcdn9naivwxhr4x0cq669zzn9f02x706-system --load=/gnu/store/xcdn9naivwxhr4x0cq669zzn9f02x706-system/boot modprobe.blacklist=pcspkr,snd_pcsp --resume=/dev/sda3 quiet

# by UUID -- does not work
jb@guixrules ~$ sudo swaplabel /dev/sdb3
swaplabel: /dev/sdb3: not a valid swap partition
jb@guixrules ~$ sudo swapon /dev/sdb3
swapon: /dev/sdb3: software suspend data detected. Rewriting the swap signature.
jb@guixrules ~$ sudo swaplabel /dev/sdb3
LABEL: resume_device
UUID:  446c81d4-efcf-4508-a9ab-bb38f74ff77d
jb@guixrules ~$ cat /proc/cmdline 
BOOT_IMAGE=/gnu/store/bkpkbms3mp8s45kpir4f2cnvxvgdvssp-linux-libre-5.4.39/bzImage --root=ed73cc09-aff3-41e4-90b6-51fb41a7d225 --system=/gnu/store/xcdn9naivwxhr4x0cq669zzn9f02x706-system --load=/gnu/store/xcdn9naivwxhr4x0cq669zzn9f02x706-system/boot modprobe.blacklist=pcspkr,snd_pcsp --resume=446c81d4-efcf-4508-a9ab-bb38f74ff77d quiet
jb@guixrules ~$ diff <(echo 446c81d4-efcf-4508-a9ab-bb38f74ff77d) <(echo 446c81d4-efcf-4508-a9ab-bb38f74ff77d)
jb@guixrules ~$ echo $?
0

# by LABEL -- does not work
jb@guixrules ~$ sudo swaplabel /dev/sdb3
swaplabel: /dev/sdb3: not a valid swap partition
jb@guixrules ~$ sudo swapon /dev/sdb3
swapon: /dev/sdb3: software suspend data detected. Rewriting the swap signature.
jb@guixrules ~$ sudo swaplabel 
swaplabel: no device specified
Try 'swaplabel --help' for more information.
jb@guixrules ~$ sudo swaplabel /dev/sdb3
LABEL: resume_device
UUID:  446c81d4-efcf-4508-a9ab-bb38f74ff77d
jb@guixrules ~$ cat /proc/cmdline 
BOOT_IMAGE=/gnu/store/bkpkbms3mp8s45kpir4f2cnvxvgdvssp-linux-libre-5.4.39/bzImage --root=ed73cc09-aff3-41e4-90b6-51fb41a7d225 --system=/gnu/store/xcdn9naivwxhr4x0cq669zzn9f02x706-system --load=/gnu/store/xcdn9naivwxhr4x0cq669zzn9f02x706-system/boot modprobe.blacklist=pcspkr,snd_pcsp --resume=resume_device quiet

# leaving it to the kernel -- does not work
jb@guixrules ~$ sudo swaplabel /dev/sdb3
swaplabel: /dev/sdb3: not a valid swap partition
jb@guixrules ~$ sudo swapon /dev/sdb3
swapon: /dev/sdb3: software suspend data detected. Rewriting the swap signature.
jb@guixrules ~$ cat /proc/cmdline 
BOOT_IMAGE=/gnu/store/bkpkbms3mp8s45kpir4f2cnvxvgdvssp-linux-libre-5.4.39/bzImage --root=ed73cc09-aff3-41e4-90b6-51fb41a7d225 --system=/gnu/store/xcdn9naivwxhr4x0cq669zzn9f02x706-system --load=/gnu/store/xcdn9naivwxhr4x0cq669zzn9f02x706-system/boot modprobe.blacklist=pcspkr,snd_pcsp resume=/dev/sdb3 quiet