To be honest, I’m not really sure about this. I’ve only installed Netrunner a couple of weeks ago and I’m not certain whether it ever worked correctly. Can I somehow go back to the non-LXQt state of the system? Uninstall LXQt and reinstall Plasma, maybe?
So, my current working hypothesis is this: Since both KDE and LXQt are affected AND there’s nothing in the logs that says “Hibernate failed”, the problem must be somewhere near the top of the stack, but not right at the top. What do Desktop environments do to hibernate the system? As in: Is this a script they call, a command they sent over DBus or something to do with acpid?
Thanks, that piece of information set me on the right way. I tried the following
$ systemctl hibernate
Failed to execute operation: Sleep verb not supported
Turns out I forgot to set up a swap partition during installation. After finding some room for swap and rebooting the system (this is important), hibernate now works.