Desktop flashes briefly on resume before going to lock screen

[Christopher Kyle Horton]

Whenever I suspend my Lenovo Yoga laptop running Wily and bring it back up, the desktop displays for a split second before correctly showing me the lock screen requesting my password. This might be a security/privacy concern.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: lightdm 1.16.3-0ubuntu1
ProcVersionSignature: Ubuntu 4.2.0-14.16-generic 4.2.2
Uname: Linux 4.2.0-14-generic x86_64
ApportVersion: 2.19.1-0ubuntu2
Architecture: amd64
CurrentDesktop: Unity
Date: Thu Oct 8 20:29:11 2015
InstallationDate: Installed on 2015-08-29 (40 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150828)
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

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

[Jaime Pérez (jaime-91)]

I'm using devel repositories and I have the same problem.

[Lasse Sundman (lasse-sundman)]

I'm seeing the same issue on my Thinkpad X230.
In addition to Unity on the stable release of 15.10, I've experienced the same problem on Ubuntu Gnome 15.10 using gnome-shell 3.16 and on Arch using gnome-shell 3.18, so could it in some way be related to this bug https://bugzilla.gnome.org/show_bug.cgi?id=753678, since Wily upgraded many Gnome parts to 3.16?

Unity in 15.04 and different versions of KDE with SDDM and XFCE with Lightdm all work fine on this laptop, so it really seems like it has something to do with Gnome 3.16.

[Rodrigo Lledó (rodhos-hp)]

I see a glitch. I can't see my desktop. I'm using Ubuntu 15.10.

[Andrew (am-public-o)]

I experience this on ASUS laptop running 15.04. All updates applied.

[Bogdan (bogdar)]

I've just installed 15.10 (with updates download during installation) on Dell XPS13 9343, using default desktop, this bug affects me a lot because I have to leave my laptop unattended many time per day with confidential information on display.

[Pat McGowan (pat-mcgowan)]

Samsung laptop on 15.04
When a suspend happens due to either an inactivity timeout or closing the lid, the last desktop is shown for 1-3 secs on resume.
When explicitly asking to Lock or Suspend through the UI it does not show the desktop but rather goes directly to the login screen as expected.

[Anton Shu (ubunutuone-6)]

I want to confirm this for Thinkpad Yoga and Ubuntu-Gnome 15.10

[Joey Kudish (joey-q)]

Having the same problem on a Dell XPS 13 9343 running Ubuntu Gnome 15.10

[Sasa Stamenkovic (umpirsky)]

I experience this issue on Asus Zenbook UX301L with Ubuntu Gnome 16.04.

[quasiyoke (quasiyoke)]

I'm able to reproduce this issue attempting to switch keyboard layout by pressing Right Alt + Right Shift keystroke on my Ubuntu Unity 16.04 lock screen.

[Stefano Forli (ntropia)]

Not sure if it's going to help narrowing down the search of a fix, but it happens also on Kubuntu, and it's going on from 14.10 up to at least 16.04.

[Stefano Forli (ntropia)]

Forgot to add important details.
The system is an Asus Zenbook UX31A with an Intel HD Graphics 4000 card.
Compositor is active (OpenGL 3.1, GLX interface).

[Rael Gugelmin Cunha (rael-gc)]

Started to happen to me on Ubuntu 16.04.2 with Intel graphics too (Dell Precision M3800).

[Eli Poulos (errpoulos)]

Happening on my dell inspiron 7568 ubuntu 18.04.1 / gnome 3.28.2

[Bill Billson Billingham (billbillbill)]

I am experiencing this on Thinkpad T460s running 64 bit Ubuntu 18.04.1 (4.15.0-42-generic) with Gnome 3.28.2, utilizing Intel® Core™ i7-6600U CPU @ 2.60GHz × 4, Intel® HD Graphics 520 (Skylake GT2)

I was not experiencing this problem on the same machine running 16.04, and only started experiencing it after upgrading to 18.04

[Maxwell Li (captainseesaw)]

I am also experiencing this on XPS 15 9570 running 64 bit Ubuntu 18.04. Gnome version 3.28.2

[Matthew Wendel (oobi)]

I am also experiencing this on a Lenovo P50, with Unity 7.5.0 and lightdm 1.26.0 running on Ubuntu 18.04 LTS

[Farzin (farzineff)]

Same issue occurring on Xubuntu 19.10. A previous comment said that it wasn't an issue on their XFCE, but it does occur on mine. (Xfce 4.14)

[Niv Gelbermann (niv.gelbermann)]

I am also experiencing this on Thinkpad E480, with Ubuntu Budgie, 18.04 through 19.10.
Currently with 19.10, Lightdm 1.28.0, Gnome 3.32.1.