screensaver shows old screen content on return from sleep

[Jeff Abrahamson]

when gnome-screensaver activates after an idle period, and so then the screen blanks, then pushing the shift key to wake the monitors and to request that gnome-screensaver display an authentication box sometimes causes the old screen (pre-lock) to display briefly before the screen redraws blank with an authentication box. One can't interact with the old display, and it's brief, no more than a second before repaint, but from a privacy standpoint it's disturbing that the content is briefly visible.

I have gnome-screensaver configured to blank the screen on idle rather than to display pictures or animations.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: gnome-screensaver 3.2.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-16.29-generic 3.0.20
Uname: Linux 3.0.0-16-generic x86_64
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Thu Mar 15 12:38:18 2012
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
ProcEnviron:
 PATH=(custom, user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-screensaver
UpgradeStatus: Upgraded to oneiric on 2012-01-09 (66 days ago)

[Launchpad Janitor (janitor)]

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

[thulle (thulle)]

Affects me on 12.04 too, gnome-screensaver 3.4.1-0ubuntu1.

[cipher sheep (ciphersheep)]

this persists in ubuntu 12.10, and also impacts mint 14

[Josh Fuhs (fuhsjr00)]

I've seen this in Ubuntu 13.04

[riban (brian-riban)]

I am seeing same symptoms in Ubuntu Studio 13.10 Final Beta 2. This uses xfce4 so this issue may not be gnome-screensaver specific. I believe this could be classed as a security issue because it occurs after sleep, before screen lock kicks in, so a user may have put the machine to sleep expecting it to be (fairly) secure but another user may subsequently see the desktop (and any open document). As a minimum it is a privacy issue.

[Pander (pander)]

See also https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1509711 and https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1581384