Timothy Murphy wrote:
1. There seems to be no hibernate option on my Fedora-23/KDE machine
in the KDE/Leave menu.
I seem to recall there used to be one?
That's up to systemd/logind to decide,
qdbus --system org.freedesktop.login1 /org/freedesktop/login1
2. I notice that CLI "shutdown -r now" seems to work much
than GUI Leave=>Shutdown.
Is the CLI command omitting something important?
Yes, it skips ending your session gracefully (allowing apps to close without
forcefully being killed).