gethin, that seems plausibly like it could suffer from the same problems
as #49579 -- if you have a menu open or a virtualbox window to a guest
or similar, the screensaver 'lock' command may not be able to lock the
That's why we recommend using the lock interface in the menus or
keyboard shortcuts, because both will either succeed easily or visibly
fail before you make the next step manually.
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Packages, which is subscribed to gnome-screensaver in Ubuntu.
Desktop contents displayed on resume, before lock screen is shown
Status in gnome-screensaver package in Ubuntu:
I am running 14.04. When I resume from sleep, the contents of my
desktop (including any open windows, emails, etc) are displayed
onscreen briefly before the unlock screen is shown. This potentially
allows an attacker to view the contents of a locked screen.
1) Suspend a machine, e.g. by closing the lid
2) Resume the machine
Upon resume, the first thing shown onscreen is the screensaver unlock screen.
Upon resume, the first thing shown onscreen is the set of open windows that
were displayed before the machine was put to sleep. After a second or two, the
unlock screen is drawn and you have to enter a password to unlock the machine.
This is reproducible on my system.
DistroRelease: Ubuntu 14.04
Package: gnome-screensaver 3.6.1-0ubuntu9
ProcVersionSignature: Ubuntu 3.13.0-8.28-generic 3.13.2
Uname: Linux 3.13.0-8-generic x86_64
Date: Fri Feb 14 09:05:50 2014
# This is a distribution channel descriptor
# For more information see
org.gnome.desktop.session session-name 'ubuntu'
org.gnome.desktop.session idle-delay uint32 300
InstallationDate: Installed on 2013-12-02 (73 days ago)
InstallationMedia: Ubuntu 12.04 "Precise" - Build amd64 LIVE Binary
UpgradeStatus: Upgraded to trusty on 2014-02-12 (1 days ago)
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