Sounds like a crash is occurring, and we have indeed encountered a few
reports like this.
To proceed with finding out which crash this is, please:
1. Apply the workaround from bug 994921.
2. Reproduce the crash.
3. Look in /var/crash for crash files and run:
ubuntu-bug /var/crash/YOURFILE.crash
4. Tell us here the ID of the new bug created.
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1769720
Title:
Logged out when unplugging external monitors with screen locked and
lid closed
Status in gnome-shell package in Ubuntu:
Incomplete
Bug description:
I am using Ubuntu 18.04 (Bionic) 64-bit on a System76 Galaga UltraPro
laptop. At work, I plug two displays into my laptop, one DisplayPort
and one HDMI.
If, while both displays are plugged in and the laptop lid is closed
and the laptop's built-in display is therefore disabled, I:
1. lock my screen;
2. unplug both displays at about the same time;
3. wait about ten seconds; and then
4. open my laptop lid,
I find that I have been logged out.
If I immediately log back in to the built-in display, a couple seconds
after I log in, the screen locks. If I then immediately log out and
log back in again, the screen does _not_ lock.
It seems that this weird lock-right-after-login behavior is related to
the fact that I get logged out as described above. It seems that the
shell remembers that it is supposed to be locked despite the crash /
logout, such that when I log back in, it realizes that it's supposed
to be locked and locks itself.
Note that I am filing this bug as instructed in
https://bugs.launchpad.net/gnome-shell/+bug/1721428/comments/105:
"BTW, we have fixed many gnome-shell bugs with these symptoms recently
in Ubuntu 18.04. So please try 18.04 and log a new bug if you have any
problems."
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gnome-shell 3.28.1-0ubuntu2
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Mon May 7 14:26:22 2018
DisplayManager: gdm3
InstallationDate: Installed on 2016-08-09 (635 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64
(20160719)
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to bionic on 2018-04-27 (10 days ago)
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