[Bug 1836488] [NEW] After session unlock the login screen is still showing

[Kevin Chen]

Public bug reported:

On my 19.04 ubuntu, I unlocked my session, but the login screen is still
showing and covers everything else.

The "Favorites" icons are showing and the top nav bar is also showing. I
can "alt-tab", but the login screen permanently covering the entire
screen. It shows the password field, and if I enter the password the
login screen doesn't disappear.

If I click "login as different user", I get to the real login screen,
but after entering my password, it get to the stuck state I described
earlier.

So it appears the login manager (i'm not sure what it's called) is
playing up.

I pressed ctrl-alt-f3 and logged in via the TTY, and killed xorg, which
was running at 100% CPU on one of my cores. This seemed to have resolved
the problem. The downside was that it also closed all of my apps.

I was running Android Studio with a emulated Nexus phone, not sure if
that might have caused some problems.

Please let me know what info I should gather if I see it again, and
happy to post it up.

** Affects: sddm (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
  After session unlock the login screen is still showing

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