Thanks for showing one way to solve such issues, and for reminding me of bluetooth devices.
I actually have two devices trusted (my headphones and a BT keyboard for testing) but not connected, and I’m sure these were turned off.
$ journalctl -u bluetooth
indeed shows no irregularities.
But it gets “curiouser and curiouser”: After leaving the laptop in hibernation after above tests for a few hours, now suddenly suspend seems to work again. Needs a few more tries to be sure, though.
I wonder what’s going on here. Ghosts?
And yes, I did also try a complete shutdown before, waiting a few minutes, and restarting the system, and suspend wouldn’t work.
There’s only two more ideas I have—could that have confused the suspend/resume system?
- It’s possible I connected the (USB-C) AC charger while it was in suspend mode. I must surely have done that before, and it shouldn’t matter (hopefully).
- I use the built-in fingerprint reader, and the Arch docs say somewhere one shouldn’t suspend/resume again within 30s. I might have inadvertently done that, but chances are almost nil, since I know about that issue.