maxpus=1 still suffers the same issue. I then disabled and stopped the upower daemon but the issue remains with the only common factors being systemd-logind and lightdm.
I tried console-only tests with lightdm stopped and CANNOT reproduce the issue. I installed sddm and changed the default display manager to use it: apt install --no-install-recommends sddm Tested with logind + sddm and CANNOT reproduce the issue. Re-enabled upower via the x-p-m applet. Tested with logind + sddm + upower/x-p-m and CANNOT reproduce the issue. Tested with logind + sddm + upower/x-p-m + light-locker and CANOT reproduce the issue (note: light-locker dies at some point so no password dialog on resume). Based on all this it seems to point the finger at ---> lightdm -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. 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: Confirmed Status in light-locker package in Ubuntu: Confirmed Status in systemd package in Ubuntu: New Status in xfce4-power-manager package in Ubuntu: Confirmed Status in xubuntu-default-settings package in Ubuntu: New 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 To manage notifications about this bug go to: https://bugs.launchpad.net/light-locker/+bug/1759950/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
