Fedora 32: hibernate/resume does not work

[fedora]

Hi everybody

Environment here:

[root@caprioli ~]# cat /etc/fedora-release
Fedora release 32 (Thirty Two)
[root@caprioli ~]#


root@caprioli ~]# uname -r
5.6.10-300.fc32.x86_64
[root@caprioli ~]#

[root@caprioli ~]# grub2-editenv - list
saved_entry=966c5755b3384d1192dbf3d3658c1e29-5.6.10-300.fc32.x86_64
kernelopts=root=UUID=3f218a1e-7f30-48b1-add4-fb17bff5a6b5 ro 
resume=UUID=0d51db0e-8463-4741-8bbe-d907fb2b1cb2
boot_success=1
boot_indeterminate=0
[root@caprioli ~]#


[cellino@caprioli ~]$ cat /proc/cmdline
BOOT_IMAGE=(hd3,gpt5)/boot/vmlinuz-5.6.10-300.fc32.x86_64 
root=UUID=3f218a1e-7f30-48b1-add4-fb17bff5a6b5 ro 
resume=UUID=0d51db0e-8463-4741-8bbe-d907fb2b1cb2
[cellino@caprioli ~]$


suspend works fine on this machine, but hibernate does›nt. Another 
installation on the same machine with fedora 31 hibernates/resumes 
flawlessly.

I assume very much that when closing down for hibernate, no image is 
created, because after booting up from (so to speak) hibernate, the last 
lines in the journal are:

[root@caprioli ~]# journalctl -b -1

<snip>

May 10 09:47:53 caprioli.dyn.lan systemd[1]: Reached target Sleep.
May 10 09:47:53 caprioli.dyn.lan systemd[1]: Starting Hibernate...
May 10 09:47:53 caprioli.dyn.lan kernel: PM: Image not found (code -22)
May 10 09:47:53 caprioli.dyn.lan kernel: PM: hibernation: hibernation entry
May 10 09:47:53 caprioli.dyn.lan systemd-sleep[3134]: Suspending system...
lines 2285-2371/2371 (END)

where the 3rd line tells me, that no image has been created and written 
to swap.

The swap partition has 19.6 GB. The memory is 16 GB. I tried to give the 
system a much larger (1 TB) swap partition, no joy.

I also tried to go down to runlevel 3 before hibernating, and then 
resume into runlevel 3: no joy.

I also tried to adapt the dracut command-line.

[root@caprioli ~]# dracut --print-cmdline
  root=UUID=3f218a1e-7f30-48b1-add4-fb17bff5a6b5 rootfstype=ext4 
rootflags=rw,relatime
[root@caprioli ~]#

to include the resume parameter, but dracut did not even take my 
dracut.conf file into consideration.

Because the Fedora 31 installation on the same machine works flawlessly 
as far as hibernate/resume is concerned, I assume the BIOS parameters 
are such, that suspending/resuming is allowed.
Does the Fedora 32 Kernel, by default, prevent hibernate/resume?

I am at a loss of ideas on how to investigate further.

Any hint is highly  appreciated. Thank you very much.

suomi