Public bug reported:

This is a pretty severe bug as protected information are revealed for a
short time before the lockscreen appears.

Steps to reproduce:

1. Suspend your computer (e.g. close laptop lid)
2. Resume your computer (e.g. open laptop lid)
3. See Desktop's content
4. Lockscreen appears

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: gdm3 3.26.1-3ubuntu3
ProcVersionSignature: Ubuntu 4.13.0-21.24-generic 4.13.13
Uname: Linux 4.13.0-21-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Thu Jan  4 12:59:20 2018
InstallationDate: Installed on 2017-09-18 (107 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: gdm3
UpgradeStatus: Upgraded to artful on 2017-10-20 (75 days ago)
modified.conffile..etc.gdm3.custom.conf: [modified]
mtime.conffile..etc.gdm3.custom.conf: 2017-10-20T22:06:33.549836

** Affects: gdm
     Importance: Medium
         Status: In Progress

** Affects: gdm3 (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: gdm3 (Fedora)
     Importance: Unknown
         Status: Unknown


** Tags: amd64 apport-bug artful

** Bug watch added: GNOME Bug Tracker #753678
   https://bugzilla.gnome.org/show_bug.cgi?id=753678

** Also affects: gdm via
   https://bugzilla.gnome.org/show_bug.cgi?id=753678
   Importance: Unknown
       Status: Unknown

** Also affects: gdm3 (Fedora) via
   https://bugzilla.gnome.org/show_bug.cgi?id=753678
   Importance: Unknown
       Status: Unknown

** Bug watch added: Red Hat Bugzilla #713640
   https://bugzilla.redhat.com/show_bug.cgi?id=713640

** Changed in: gdm3 (Fedora)
 Remote watch: GNOME Bug Tracker #753678 => Red Hat Bugzilla #713640

** Information type changed from Private Security to Public

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You received this bug notification because you are a member of Ubuntu
Desktop Bugs, which is subscribed to gdm3 in Ubuntu.
https://bugs.launchpad.net/bugs/1741248

Title:
  After resume from suspend gdm reveals content from the desktop before
  the lock screen appears

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