Shield screen is displayed after blanking even when lock screen disabled

[Jason Gambrel]

Ubuntu 19.04 Gnome

Screen lock is set to off in Settings->Privacy. Blank Screen is set to 10 minutes in Settings->Power. On returning from Screen Blank, Lock Screen is present. Does not occur after manual suspend (ie closing laptop lid) and resuming.

In dconf I have set org/gnome/desktop/lockdown/disable-lock-screen to true.
org/gnome/desktop/screensaver/lock-enabled is set to false
org/gnome/desktop/screensaver/ubuntu-lock-on-suspend is set to false

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: gnome-shell 3.32.0+git20190410-1ubuntu1
ProcVersionSignature: Ubuntu 5.0.0-13.14-generic 5.0.6
Uname: Linux 5.0.0-13-generic x86_64
ApportVersion: 2.20.10-0ubuntu27
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sat May 4 19:25:36 2019
DisplayManager: gdm3
InstallationDate: Installed on 2019-04-22 (12 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
ProcEnviron:
 LANGUAGE=en_CA:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.xdg.autostart.gnome-shell-overrides-migration.desktop: [modified]
mtime.conffile..etc.xdg.autostart.gnome-shell-overrides-migration.desktop: 2019-04-24T23:58:15.215728

[Daniel van Vugt (vanvugt)]

This sounds like a bug I have heard reported elsewhere, but can't find the other reports right now.

[Jason Gambrel (jaygambrel)]

Also tried editing /etc/default/acpi-support and commenting out the line LOCK_SCREEN=true. That did not work.

Just found a workaround that seems to take care of the problem. Install the Gnome Extension: Disable Screen Shield and activate it. The lock screen no longer appears after screen blanking.

[Jason Gambrel (jaygambrel)]

My mistake, it is still present. I just wasn't waiting long enough after the screen blank before waking the screen up. Waited a bit and it is back, even with the extension running.

[Sebastien Bacher (seb128)]

What do you call "lock screen"? Do you have to enter your password or do you only mean the "banner" screen?

[Jason Gambrel (jaygambrel)]

Sorry, but I am not sure I could tell the difference so I will try and describe it as best I can.

There is no place to enter a password, but I also have my system set to automatically log in, so I'm not sure if it would ask me for a password if it was displayed. I do have to press a key to get past the screen.

I have attached a picture of the screen. I was not able to do a screen capture as it would not let me with the screen displayed, so I used my phone's camera. I will also attached a screen capture showing my settings for choice of background and lock screen in the next comment as I can only attach one file per comment. Hopefully this will clarify things.

[Jason Gambrel (jaygambrel)]

Here is the screen capture with the background settings.

[Jason Gambrel (jaygambrel)]

Correction: I have to push the Enter key to dismiss the screen, not any other key.

[Sebastien Bacher (seb128)]

Thanks for the details, the screen is not locked in your case.
That has been reported upstream as https://gitlab.gnome.org/GNOME/gnome-shell/issues/681
You might want to comment on the gitlab to explain why you find it disturbing

[Jason Gambrel (jaygambrel)]

Thank you for the update and the explanation. I will post some feedback on gitlab.

[Daen WWW (daenwww)]

I am redirected here from gnome-shell/+bug/1834817

Reason for importance: the system is my main media server. Movies black out at random times (15-30 minutes) requiring keyboard unlocking of the screen using ctrl+alt+Enter.

[Daniel van Vugt (vanvugt)]

Playing movies should prevent the screen from blanking. If it doesn't then please log a bug against the video player you are using. If you are using Wayland sessions then it is mutter bug 1740771.

[Daen WWW (daenwww)]

This is a clean system - nothing but default packages. Streaming video in Firefox.
Happy to run commands to provide you what you need to know.

I do not know if I am using 'Wayland sessions' or not. bug 1740771 refers to 'screensaver' - I have not activated one and cannot locate settings for one on my system.

If I search for screensaver in Applications (Dock>Show applications) I see a few options avail that would require installation only.

I have toggled the Power settings again - will advise if this prevents blanking.

[Daen WWW (daenwww)]

1. Settings>Power>Blank Screen was OFF, but switched this back ON then OFF again
2. The randomness of the blanking period between 15-30 min suggested issue was with ScreenLock
3. ScreenLock (per this bug) is tied to screen blanking
4. GitHub upstream considering 3 options on screen blanking like Android (nothing, lock, hibernate)
5. Screen Lock in my case was a symptom of what appears to be a glitch in screen blanking
6. Toggling screen blanking ON/Off resolved my issue

The randomness in the times of the screen blanking while an issue, is no longer an issue I have as the system now is set to OFF - and so far has remained off.

Thanks for your help vanvugt

[Andrej Shadura (andrew.sh)]

Quoting Florian Müllner from https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/767#note_627334:

> The new lock screen design (which are currently in the process of being implemented and will be in 3.36) no longer have the shield.
> It doesn't look useful to add a work-around that will only be included in few unstable development releases (and removing the screen fade very much is a work-around).

Meanwhile, maybe reworked patch from that MR can be included in Ubuntu?

[Launchpad Janitor (janitor)]

This bug was fixed in the package gnome-shell - 3.35.91-1ubuntu2

---------------
gnome-shell (3.35.91-1ubuntu2) focal; urgency=medium

  * control: Fix package for Yaru Breaks. It's called `yaru-theme-gnome-shell`
    and not `yaru-theme`
  * control: Bump Breaks on appindicator and desktop-icons.
    These have been updated for GNOME 3.36

gnome-shell (3.35.91-1ubuntu1) focal; urgency=medium

  * Merge with Debian. Remaining changes:
    + Replace gnome-backgrounds dep with ubuntu-wallpapers and Suggests
      gnome-themes-standard-data, gnome-backgrounds
    + Add some Recommends:
      - ubuntu-session (| gnome-session) to have the ubuntu session available
      - xserver-xorg-legacy
      - yaru-theme-gnome-shell for the default ubuntu theming
    + Update debian/gbp.conf with Ubuntu settings
    + gnome-shell-common.install: Install Ubuntu mode
    + gnome-shell-common.prerm: Remove deprecated ubuntu theme alternative
    + ubuntu/desktop_detect.patch:
      - add caching for desktop detection to avoid querying the current
        desktop env variable as iterate through the list each time. For the
        time of the Shell process, we can expect this env variable to stay
        stable.
    + ubuntu/smarter_alt_tab.patch:
      - quick alt-tab (without showing up the switcher) switch only between
        the last window of the last 2 applications to be focused instead of
        raising all windows of those apps.
    + ubuntu/lightdm-user-switching.patch:
      - Allow user switching when using LightDM.
    + ubuntu/lock_on_suspend.patch
      - Respect Ubuntu's lock-on-suspend setting.
    + ubuntu/background_login.patch
      - Change default background color as we modified the default GDM color
        for our ubuntu session.
    + ubuntu/gdm_alternatives.patch
      - Add support for GDM3 theme alternatives
    + optional-hot-corner.patch
      - enable patch proposed by upstream developer already in package (but
        not in series) to add a settings for optional hot corner activation.
    + main-show-an-error-message-on-gnome-shell-crash.patch,
      global-make-possible-to-set-debug-flags-dynamically.patch,
      main-increase-the-granularity-of-backtraces-in-SHELL_DEBU.patch,
      main-add-backtrace-crashes-all-and-backtrace-all.patch,
      sessionMode-add-support-for-debugFlags-parameter.patch:
      - Improve debug JS tracing for crash reports
    + st-scroll-view-Handle-the-case-where-scrollbars-are-NULL.patch:
      - Fix crash on theme changes
    + ubuntu/search-call-XUbuntuCancel-method-on-providers-when-no-dat.patch:
      - stop searches when requested from UI
    + magnifier-Show-cursor-when-magnifier-is-enabled-and-scale.patch:
      - Show monitor scaled cursor when magnifier is enabled
    + Break gnome-shell-extension-appindicator (<< 30)
    + Break gnome-shell-extension-desktop-icons (<< 19.01.3+git20190814)
    + Break gnome-shell-extension-ubuntu-dock (<< 67ubuntu20.04.1)
    + Break yaru-theme (<< 20.04.2)
  * debian/control:
    - Bump breaks on gnome-shell-extension-ubuntu-dock (<< 67ubuntu20.04.1)
    - Bump breaks on gnome-shell-extension-dashtodock (<< 67+git20200225-1)
    - Bump breaks on yaru-theme...