Works on my Dell XPS 15 9550. But contrary to normal suspend, this takes quite long for
the machine to shut down. It was about 25 seconds and my 16 GB RAM was used up to 8 GB,
but still 25 seconds are a bit long for an SSD.
And I have to say that it killed my `rpm-ostree upgrade` on my F29SB, which I previous
ran. Seems it conflicts with the OSTree state selection in Grub? I think the new OSTree
layer then wasn’t even present there at reboot after hybernate.