Public bug reported:

To reproduce on a laptop:
1. Open a virtual machine using VirtualBox (Windows 10 machine, not sure if it 
matters)
2. Enter full-screen mode
3. Close the laptop's lid
4. Wait a few seconds, and open the lid

The session should be locked and you should see the lock screen. But instead 
you can see the virtual machine and use it.
After ~20 seconds, or after you exit the full-screen mode, the session is 
locked.

Maybe the virtual machine gets the ACPI signal somehow? But then why
does the screen lock after a few seconds?

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: gnome-screensaver 3.6.1-7ubuntu4
ProcVersionSignature: Ubuntu 4.13.0-41.46~16.04.1-generic 4.13.16
Uname: Linux 4.13.0-41-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.17
Architecture: amd64
CurrentDesktop: Unity
Date: Tue May 15 04:02:13 2018
GnomeSessionIdleInhibited: No
GnomeSessionInhibitors: None
GsettingsGnomeSession:
 org.gnome.desktop.session session-name 'ubuntu'
 org.gnome.desktop.session idle-delay uint32 0
InstallationDate: Installed on 2017-08-01 (286 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 
(20170215.2)
SourcePackage: gnome-screensaver
Symptom: security
Title: Screen not locked when coming out of suspend/hibernate
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: gnome-screensaver (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-screensaver in Ubuntu.
https://bugs.launchpad.net/bugs/1771237

Title:
  Screen not locked when coming out of suspend, and VirtualBox is in
  full-window

Status in gnome-screensaver package in Ubuntu:
  New

Bug description:
  To reproduce on a laptop:
  1. Open a virtual machine using VirtualBox (Windows 10 machine, not sure if 
it matters)
  2. Enter full-screen mode
  3. Close the laptop's lid
  4. Wait a few seconds, and open the lid

  The session should be locked and you should see the lock screen. But instead 
you can see the virtual machine and use it.
  After ~20 seconds, or after you exit the full-screen mode, the session is 
locked.

  Maybe the virtual machine gets the ACPI signal somehow? But then why
  does the screen lock after a few seconds?

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: gnome-screensaver 3.6.1-7ubuntu4
  ProcVersionSignature: Ubuntu 4.13.0-41.46~16.04.1-generic 4.13.16
  Uname: Linux 4.13.0-41-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.17
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Tue May 15 04:02:13 2018
  GnomeSessionIdleInhibited: No
  GnomeSessionInhibitors: None
  GsettingsGnomeSession:
   org.gnome.desktop.session session-name 'ubuntu'
   org.gnome.desktop.session idle-delay uint32 0
  InstallationDate: Installed on 2017-08-01 (286 days ago)
  InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 
(20170215.2)
  SourcePackage: gnome-screensaver
  Symptom: security
  Title: Screen not locked when coming out of suspend/hibernate
  UpgradeStatus: No upgrade log present (probably fresh install)

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