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[Bug 1431979] [NEW] gdm reveals the last screen right before locking screen after screen turned black

 

Public bug reported:

After my screen is turned off due to inactivity and I return to the PC
(after the screen has been turned off for some time) and move the mouse
the login screen (for locked session) is displayed, but not immediately
- the last visible screen before I left the PC is visible for some
instants (can be up to several seconds if the system is under load) and
reveals what should be protected by session locking. `lightdm` does the
job better by showing the session lock screen immediately.

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: gdm 3.10.0.1-0ubuntu7.1
Uname: Linux 3.19.1-031901-generic x86_64
ApportVersion: 2.14.7-0ubuntu8.2
Architecture: amd64
CurrentDesktop: Unity
Date: Fri Mar 13 18:18:42 2015
EcryptfsInUse: Yes
InstallationDate: Installed on 2015-01-26 (45 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: gdm
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug third-party-packages utopic

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Packages, which is subscribed to gdm in Ubuntu.
https://bugs.launchpad.net/bugs/1431979

Title:
  gdm reveals the last screen right before locking screen after screen
  turned black

Status in gdm package in Ubuntu:
  New

Bug description:
  After my screen is turned off due to inactivity and I return to the PC
  (after the screen has been turned off for some time) and move the
  mouse the login screen (for locked session) is displayed, but not
  immediately - the last visible screen before I left the PC is visible
  for some instants (can be up to several seconds if the system is under
  load) and reveals what should be protected by session locking.
  `lightdm` does the job better by showing the session lock screen
  immediately.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: gdm 3.10.0.1-0ubuntu7.1
  Uname: Linux 3.19.1-031901-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8.2
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Fri Mar 13 18:18:42 2015
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-01-26 (45 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  SourcePackage: gdm
  UpgradeStatus: No upgrade log present (probably fresh install)

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Follow ups

References