It turns out I can reproduce this with unity-greeter (on zesty). I get the following: 1. Log into session from greeter 2. Switch to greeter and log in again (returned to session) 3. Switch to greeter and log in again Switched to black screen, can manually VT switch back to session but need to unlock it from screen locker. 4. Switch to greeter and log in again Returned to session, but screen locker shown.
There were a couple of bugs regarding signals and return values from greeters which I have fixed in lp:lightdm, but these don't seem to have caused the issue. Still investigating... ** Changed in: lightdm (Ubuntu) Assignee: (unassigned) => Robert Ancell (robert-ancell) ** Changed in: lightdm (Ubuntu) Status: Confirmed => In Progress -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to lightdm in Ubuntu. https://bugs.launchpad.net/bugs/1656399 Title: Unable to unlock session after suspend using lightdm-gtk-greeter. Status in light-locker package in Ubuntu: Confirmed Status in lightdm package in Ubuntu: In Progress Bug description: Unable to unlock Xubuntu XFCE session after suspend. I'm presented with unlock screen, and entering credentials will redirect to a black screen with "This session is locked", and "you will be redirected to unlock screen". To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/light-locker/+bug/1656399/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp