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
Status in Light-Locker:
New
Status in Xfce4 Power Manager:
Unknown
Status in light-locker package in Ubuntu:
Invalid
Status in systemd package in Ubuntu:
New
Status in xfce4-power-manager package in Ubuntu:
Confirmed
Bug description:
I'm currently testing Xubuntu 18.04 after a do-release-upgrade from
16.04.
I discovered a very weird issue. When doing S3 sleep via closing the
lid, on resume the lock screen appears, I authenticate, but as soon as
it switches to the user session the screen goes blank - not even a
backlight.
Switching to other ttys works and they display correctly but the GUI
user session remains blank.
If the system is manually suspended (not using the lid), then resumed
either by opening the lid or pressing the power button, the GUI user
session is fine.
I narrowed it down to xfce4-power-manager and discovered disabling the
lock-screen cured the issue.
I cloned the repository and reviewed commits between 1.7 and 1.8.
Fortunately there aren't many. Looking at 6365683 "Proper exit status
for light-locker-command" I suspected the change in the SetActive
return value, and reverted it.
After a build/install cycle I've found the system now behaves
correctly so I think the change should be reverted.
I've created an issue upstream for this at
https://github.com/the-cavalry/light-locker/issues/108
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