Screen temporarily not locked when coming out of suspend

Bug #1509711 reported by svenmeier
This bug affects 10 people
Affects Status Importance Assigned to Milestone
gnome-screensaver (Ubuntu)

Bug Description

When I resume my notebook after suspend, the desktop with all open applications is displayed for about 1-2 seconds until the password prompt finally is shown. This happens every time when resuming in Ubuntu 15.10.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: gnome-screensaver (not installed)
ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
Uname: Linux 4.2.0-16-generic x86_64
ApportVersion: 2.19.1-0ubuntu3
Architecture: amd64
CurrentDesktop: GNOME
Date: Sat Oct 24 22:19:07 2015
InstallationDate: Installed on 2015-04-27 (180 days ago)
InstallationMedia: Ubuntu-GNOME 15.04 "Vivid Vervet" - Release amd64 (20150422)
SourcePackage: gnome-screensaver
Symptom: security
Title: Screen not locked when coming out of suspend/hibernate
UpgradeStatus: Upgraded to wily on 2015-10-11 (13 days ago)

Revision history for this message
svenmeier (sven-meiers) wrote :
information type: Private Security → Public Security
Changed in gnome-screensaver (Ubuntu):
status: New → Triaged
Changed in gnome-screensaver (Ubuntu):
importance: Undecided → High
Revision history for this message
Harry P (hjwp2) wrote :

I reported the dupe at This bug has been around for a couple of releases I'd say, definitely as far back as 14.04...

Revision history for this message
svenmeier (sven-meiers) wrote :

The problem does no longer show up with kernel 4.4.0.

@hjwp2: perhaps you could try out the mainline kernel from too?

Revision history for this message
Harry P (hjwp2) wrote :

Since the upgrade to Xenial, I haven't seen this bug. Unless it affects any other LTS editions, I guess it's ok to close?

Revision history for this message
svenmeier (sven-meiers) wrote :

I can no longer reproduce this with 16.10, thus it can be closed.

Revision history for this message
Martin Weis (martin-weis-newsadress) wrote :

I experience this sometimes (currently running 16.04 LTS), you can easily enlarge the time by:

* high load, have processes running taking 100% CPU
* a lot of used RAM
* slow I/O (hard disk)

E.g., on a netbook, I was regularly even able to type in commands on open shells, start or close programs.
It still happens on a decent machine, but less often and with much shorter "flashing".

Revision history for this message
Pander (pander) wrote :

This also occurs in Lubuntu 18.10 with xscreensaver, LXQt and sddm

tags: added: cosmic
Pander (pander)
tags: added: bionic
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