Huh. So when hybrid suspend+hibernate happened, I had a randomly
encrypted swap setup. So this obviously can't ever be recovered from,
because the key is lost. Well, actually the key is in the image on
encrypted swap. So the only copy of the key is encrypted. Ha.

Anyway, after setting up an ordinary plain partition swap, updating
fstab, and adding resume=UUID= boot param; plain hibernate with 'sudo
systemctl hibernate' enters and exits  hibernation normally even
though Secure Boot is enabled. So something has changed. I've asked on
the kernel list.

I haven't tested hybrid sleep again yet, so I'm still not sure what
that immediate wake up is all about. Anyone looking to get more info
about this should add the 'no_console_suspend' boot param. It might
help give an idea what's going on, but there's also some chance this
ends up relating to ACPI (a very deep dark rabbit hole).

---
Chris Murphy
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