@matt-mattcaron (comment #118): thanks, those changes made power settings work for me. (Begging the question of why Xubuntu is not configured this way to begin with.) Sufficed to
$ sudo killall -HUP systemd-logind
to make that take effect without reboot. So now I need only remember to lock my screen before closing the lid to work around this bug, and I can later reopen the lid and unlock the session and all is well.
@matt-mattcaron (comment #118): thanks, those changes made power settings work for me. (Begging the question of why Xubuntu is not configured this way to begin with.) Sufficed to
$ sudo killall -HUP systemd-logind
to make that take effect without reboot. So now I need only remember to lock my screen before closing the lid to work around this bug, and I can later reopen the lid and unlock the session and all is well.