Screen temporarily not locked when coming out of suspend

[svenmeier]

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)

[Harry P (hjwp2)]

I reported the dupe at https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1508148. This bug has been around for a couple of releases I'd say, definitely as far back as 14.04...

[svenmeier (sven-meiers)]

The problem does no longer show up with kernel 4.4.0.

@hjwp2: perhaps you could try out the mainline kernel from http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4-wily/ too?

[Harry P (hjwp2)]

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?

[svenmeier (sven-meiers)]

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

[Martin Weis (martin-weis-newsadress)]

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".

[Pander (pander)]

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