Turns out this *is* systemd-logind and xfce4-power-manager fighting over
the lid close event.
It can be solved with:
echo "HandleLidSwitch=ignore" | sudo tee -a /etc/systemd/logind.conf
echo "HandleLidSwitchExternalPower=ignore" | sudo tee -a
/etc/systemd/logind.conf
If you're doing this change from a TTY console whilst the GUI session
has gone dark, then simply:
$ sudo systemctl restart lightdm
** Also affects: systemd (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1759950
Title:
Lid-close suspend: blank screen when switching to user session
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