Created attachment 800285 [details]
Journal for a correct reboot

Often, but not always, a delay is seen at shutdown, apparently limited to 1m30s
by a timeout, on a pretty default Gnome install on an "Optimus" laptop.
Seen on all tested builds of 15.1beta, currently at 429.2
Seems a regression, not seen in Leap 15.0 or previous openSUSE IIRC.
Please find attached the journal for a correct reboot and for a delayed one,
but I don't see any meaningful cue.
Feel free to ask for additional logs or tests, usual suspects like USB,
external filesystems, network, Plymouth not apparently involved.