Icon dock visible on lock screen

[Wolf Rogner]

When locking the machine with alt-L the icon dock is still visible.

After Login, the dock does not get adjusted to the top menu.

In rare cases, the dock does not respond any more. This requires a reboot of the machine

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: mutter 3.30.1-1
ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12
Uname: Linux 4.18.0-10-generic x86_64
ApportVersion: 2.20.10-0ubuntu13
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue Oct 23 12:59:27 2018
InstallationDate: Installed on 2018-04-30 (176 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
SourcePackage: mutter
UpgradeStatus: Upgraded to cosmic on 2018-10-20 (2 days ago)

[Simon Braun (simon.braun)]

I can confirm this
- except the freezing/non-responding on a fresh Ubuntu Installation.
I installed with 18.04 and upgraded to 18.10 afterwards.
The default dock (no dock extension in use) is visible and fully functional at the lock-screen.
The problem occurs not always, but - estimated - at over 50% of all lock-screens.

Full functional dock, e.g.:
- Execution of the Favorites/applications is possible
- Pre-view of application windows is possible

[Launchpad Janitor (janitor)]

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

[Anders Hall (a.hall)]

Same problem after upgrade from 18.04 to 18.10. However, the whole screen is visible when manually locking the screen (ctrl + alt + L in my case).

All programs are minimized when locking manually/or resuming from suspend and the screen goes slightly blurry, but not enough to distort text for instance. I.e., i can see everything. The exact same thing happens after suspend (lid closing/opening).

Also I can actually close programs by right clicking icons and access the dock menu as well as the top bar menu (e.g., se wifi info, click on settings panel etc).

Noticed that if i do ctrl + alt + L followed by a second ctrl + alt + L after a short wait period - then the correct lock screen appears.

I have lock enabled after 5 minutes and suspend. No auto login and no extensions at all enabled.

gnome-shell --version
GNOME Shell 3.30.1

uname -a
Linux computer 4.18.0-10-generic #11-Ubuntu SMP Thu Oct 11 15:13:55 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

(same problem as this guy is having: https://askubuntu.com/questions/1085426/desktop-is-visible-after-suspend).

[Anders Hall (a.hall)]

Btw, for me this happens 100% of all suspend/manual lock cases. Gnome has crashed once completely as well since upgrade due to this issue. In 18.04 the whole screen was visible sometimes for a very short period of time after lock, this is worse.

[Launchpad Janitor (janitor)]

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

[Wolf Rogner (war-rsb)]

The activity menu remains operational. This leads to the situation that applications can be started, stopped and system tools be launched.

[Plurtu (plurtu)]

Workaround is to change the Dash to Dock setting "Customize opacity - Tune the dash background opacity" to "Fixed".

[Anders Hall (a.hall)]

Hi @Plurto. Where is this setting and is it a default ubuntu setting? Thanks.

Note: Just using the default installation (had no active extensions before upgrade besides Ubuntu system defaults). I.e., have not installed dash to dock.

[Plurtu (plurtu)]

Just put this into terminal:

gsettings set org.gnome.shell.extensions.dash-to-dock transparency-mode FIXED

[ronzo (ronaldw)]

In 80% of the occurrences I can also see the whole desktop as I left it which is, apart from being a security risk, extremely irritating. (This is happening on the only computer that has a dual monitor setup.)

[Anders Hall (a.hall)]

@Plurto your workaround was successful for my case as well. Thanks. Weird bug, transparency affecting clicks and interaction through a lock screen.

[Juan Leni (jleni)]

This should be considered high priority and a security risk. After locking the computer, it is still possible to launch applications without unlocking.
I cannot understand why it is taking so long to define the importance of this bug.

[Wolf Rogner (war-rsb)]

It gets better all the while.

Now the desktop shows completely (with open application windows). Interaction is not possible in the windows but the content can be seen.

[Wolf Rogner (war-rsb)]

Just to let others know:
@Plurto 's suggestion to set the dock transparency to FIXED (which makes the dock assume a static color) does not remedy the situation on my machines.

I tried with different transparency settings as well.

The issue still exists

[Plurtu (plurtu)]

The most common 18.10 stack trace I've seen people report is due to the transparency setting. However anything that triggers an exception in Dash to Dock when it is disabled on the lockscreen produces this issue so there are many possible causes.

https://gitlab.gnome.org/GNOME/gnome-shell/issues/237

[Dmytro Korzhevin (korg)]

Created some photos of this issue:

https://photos.app.goo.gl/YeryTjUuLvDE8GxR8

Issue still exist with all updates installed.

Dmitry

[Thompson Plyler (impureascetic)]

I just noticed this issue this morning. I can't see previews, but I can see dock items and their current status (running or not).

[R_volkmann (r-volkmann)]

Fresh 18.10 install, everything updated. Happens quite often, but not always (30% ?).

I have installed following extra extensions: Unite, Caffeine.
Nvidia Graphics driver is installed.

It looks exactly the same as in @korg's photos, including previews. Apps can be started by clicking.
I'm totally with @jleni's comment (#14), Imho, this is quite a huge security issue.

[Michael MacEachern (maceach-b)]

I have this as well as seen here: https://i.imgur.com/Om2BHoW.jpg

This is a massive security risk and needs to be solved ASAP!

[MN (maxim-novozhilov)]

effects me either :/ the dock is visible, and extensions are not re-enabled after login...

[Shane Henry (firefightertcfd)]

I am effected by this as well. Ubuntu 18.04

[Julien Stalder (zendre4)]

Same problem (Ubuntu 18.04)

[Richard Popelis (riki357)]

Same problem
Ubuntu 18.10
Linux 4.18.0-13-generic #14-Ubuntu SMP Wed Dec 5 09:04:24 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

[Sakda W. (kok26th)]

Same! Ubuntu 18.04.1 LTS Linux 4.15.0-44-generic #47-Ubuntu SMP Mon Jan 14 11:26:59 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
The dock menu still exist when the screen has been locked.
Unstable Gnome gui and dock after locked screen and relogin. The dock seem to re-adjust width every time that I click the icon menu.

[Sakda W. (kok26th)]

after uninstall gnome-shell-extensions and update gnome-shell-extension-ubuntu-dock package, the lock screen is normal now without visible dock on locked screen.
....
gnome-shell-extension-ubuntu-dock/bionic-updates,bionic-updates,now 0.9.1ubuntu18.04.3 all [installed,automatic]
....

[Paul Johnston (searchgurus007)]

Fri May 24 15:13:53 EDT 2019
I can confirm this is happening in 19.04 (fresh installation)

[Daniel van Vugt (vanvugt)]

This bug is closed (via bug 1769383).

If you have any ongoing problems then please open a new bug by running:

  ubuntu-bug gnome-shell-extension-ubuntu-dock