Screen lock won't work

[Yuri Weinstein]

Screen lock won't work i focal.

Used to work fine on Super-L and now what happens it freezes for awhile (suspect time out defined) and then blinks and comes back into windows session.
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ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 20.04
InstallationDate: Installed on 2020-04-08 (46 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200402)
Package: gdm3 3.34.1-1ubuntu1
PackageArchitecture: amd64
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 5.4.0-31.35-generic 5.4.34
Tags: focal
Uname: Linux 5.4.0-31-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
_MarkForUpload: True
mtime.conffile..etc.gdm3.custom.conf: 2020-04-16T12:53:22.919694
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27.2
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
DisplayManager: gdm3
DistroRelease: Ubuntu 20.04
InstallationDate: Installed on 2020-04-08 (54 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200402)
Package: gnome-shell 3.36.2-1ubuntu1~20.04.1
PackageArchitecture: amd64
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 5.4.0-33.37-generic 5.4.34
RelatedPackageVersions: mutter-common 3.36.2-1ubuntu1~20.04.1
Tags: focal
Uname: Linux 5.4.0-33-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
_MarkForUpload: True

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Sebastien Bacher (seb128)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command, as it will automatically gather debugging information, in a terminal:

  apport-collect 1880337

When reporting bugs in the future please use apport by using 'ubuntu-bug' and the name of the package affected. You can learn more about this functionality at https://wiki.ubuntu.com/ReportingBugs.

[Yuri Weinstein (yuri-weinstein)]

apport information

[Yuri Weinstein (yuri-weinstein)]

apport information

[Yuri Weinstein (yuri-weinstein)]

apport information

[Yuri Weinstein (yuri-weinstein)]

@Sebastien Bacher (seb128)
Done
Thanks !

[Daniel van Vugt (vanvugt)]

Sounds like maybe bug 1851992, or bug 1652618. Please run this command and tell us what you see:

  gsettings list-recursively org.gnome.desktop.lockdown

[Yuri Weinstein (yuri-weinstein)]

@Daniel van Vugt (vanvugt)

gsettings list-recursively org.gnome.desktop.lockdown
org.gnome.desktop.lockdown mount-removable-storage-devices-as-read-only false
org.gnome.desktop.lockdown disable-command-line false
org.gnome.desktop.lockdown disable-log-out false
org.gnome.desktop.lockdown disable-printing false
org.gnome.desktop.lockdown disable-lock-screen false
org.gnome.desktop.lockdown disable-print-setup false
org.gnome.desktop.lockdown disable-user-switching false
org.gnome.desktop.lockdown disable-application-handlers false
org.gnome.desktop.lockdown disable-save-to-disk false
org.gnome.desktop.lockdown user-administration-disabled false

[Daniel van Vugt (vanvugt)]

OK, that's not the problem...

Next please try disabling Bluetooth and unplugging any USB keyboard/mouse. Now when the screen lock times out does it stay off?

[Yuri Weinstein (yuri-weinstein)]

I see no diff and screen lock still not working after Bluetooth off and removing all USB devices.
I even tried removing my docking station and no diff :(

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Brett D (brettface)]

I am seeing this exact behavior as well.

In my case, hitting Super-L will blank the screen for a half second, and when it comes back, all of my hidden windows (windows behind other windows) have been brought forward.

I need to repeat this process and hit Super-L a total of four times before I see the lockscreen.

Yuri, are you able to lock the desktop at all by hitting Super-L several times?

[Yuri Weinstein (yuri-weinstein)]

No I can't.
I see screen freeze, then timing out and then blank default color and immediately after that unfreeze

[Diegstroyer (diegstroyer)]

I've noticed that when the computer is idle, it tries to lock the screen, but a few seconds later, it returns to the desktop.

There seems to be some process that prevents the screen lock when it occurs.

[Diegstroyer (diegstroyer)]

Good news, i find the issue, the problem are the gnome extensions, back up your .local/share/gnome-shell/ data and erase all your extensions, restart the shell and try to lock screen (it works for me).

After, install one by one extensions and, for each, try lock screen since find the buggie extension.

[Daniel van Vugt (vanvugt)]

That's a good point. A few people are finding buggy extensions (especially dash-to-panel) are causing a crash on screen lock, which causes a blink and the lock to fail. That's mostly covered by bug 1877774.

So yes, please do make sure you remove all your extensions as part of the testing process.

[Diegstroyer (diegstroyer)]

Hi again, in my case, Dash-to-panel is the guilty, installed by synaptic... removing it and installing from Gnome.org solve the problem.

[Daniel van Vugt (vanvugt)]

That is bug 1877774.

[Brett D (brettface)]

In my case I was able to narrow down the problem to the gTile extension. (I've never had Dash-to-panel installed.)

Now all I have to do is find a way to live without gTile :) Thanks for the tip!

[Diegstroyer (diegstroyer)]

I find other extensions with same bug:
Panel-OSD
Unite

[Yuri Weinstein (yuri-weinstein)]

https://github.com/home-sweet-gnome/dash-to-panel/issues/1026

[Daniel van Vugt (vanvugt)]

Yuri, this sounds like a possible duplicate of some existing bug (like maybe bug 1877774 or bug 1877760). To help us confirm that please:

1. Run this command and send us the output:

   gsettings list-recursively org.gnome.shell

2. Follow these instructions:

   https://wiki.ubuntu.com/Bugs/Responses#Missing_a_crash_report_or_having_a_.crash_attachment

[Yuri Weinstein (yuri-weinstein)]

Done.

gsettings list-recursively org.gnome.shell
org.gnome.shell app-picker-view uint32 0
org.gnome.shell command-history ['r']
org.gnome.shell disable-user-extensions false
org.gnome.shell always-show-log-out true
org.gnome.shell disable-extension-version-validation true
org.gnome.shell favorite-apps ['org.gnome.Nautilus.desktop', 'snap-store_ubuntu-software.desktop', 'firefox.desktop', 'google-chrome.desktop', 'terminator.desktop', 'pidgin.desktop', 'update-manager.desktop', 'keepass2.desktop', 'org.gnome.tweaks.desktop', 'org.gnome.Screenshot.desktop', 'vinagre.desktop', 'ccsm.desktop', 'gnome-control-center.desktop', 'gnome-system-monitor_gnome-system-monitor.desktop', 'timeshift-gtk.desktop']
org.gnome.shell had-bluetooth-devices-setup false
org.gnome.shell looking-glass-history @as []
org.gnome.shell enabled-extensions ['<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>', 'suspend-button@laserb', '<email address hidden>', '<email address hidden>', 'gnome-shell-trash-extension', '<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>', 'invert-window@maiself', '<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>', 'hastebin-from-clipboard@<email address hidden>']
org.gnome.shell disabled-extensions ['<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>']
org.gnome.shell development-tools true
org.gnome.shell introspect false
org.gnome.shell remember-mount-password false
org.gnome.shell.keybindings switch-to-application-1 ['<Super>1']
org.gnome.shell.keybindings switch-to-application-7 ['<Super>7']
org.gnome.shell.keybindings toggle-message-tray ['<Super>v', '<Super>m']
org.gnome.shell.keybindings switch-to-application-6 ['<Super>6']
org.gnome.shell.keybindings open-application-menu ['<Super>F10']
org.gnome.shell.keybindings switch-to-application-5 ['<Super>5']
org.gnome.shell.keybindings toggle-application-view ['<Super>a']
org.gnome.shell.keybindings switch-to-application-4 ['<Super>4']
org.gnome.shell.keybindings focus-active-notification ['<Super>n']
org.gnome.shell.keybindings switch-to-application-3 ['<Super>3']
org.gnome.shell.keybindings switch-to-application-9 ['<Super>9']
org.gnome.shell.keybind...

[Yuri Weinstein (yuri-weinstein)]

apport information

[Yuri Weinstein (yuri-weinstein)]

apport information

[Yuri Weinstein (yuri-weinstein)]

apport information

[Yuri Weinstein (yuri-weinstein)]

apport information

[Yuri Weinstein (yuri-weinstein)]

apport information

[Daniel van Vugt (vanvugt)]

Thanks. Since you have dash-to-panel then it's highly likely this is bug 1877774. So we can leave this as a duplicate of bug 1877774. If you disagree then please follow these instructions to help us investigate further:

https://wiki.ubuntu.com/Bugs/Responses#Missing_a_crash_report_or_having_a_.crash_attachment

[Lucas Ariel Pasut (calusa97)]

hello,
I need help with the same error. In my case use a laptop and a extra monitor. When lock the system, the screen of the laptop is freezes. I am running the 3.36.8 gnome version con ubuntu 20.4 Focal. Is a clean installation. in the path /.local/share/gnome-shell only have this application_state gnome-overrides-migrated notifications

thanks

[Daniel van Vugt (vanvugt)]

This bug is closed as a duplicate of bug 1877774, which is also closed as Fix Released.

If you experience any current problems then please open a new bug by running:

  ubuntu-bug gnome-shell