Public bug reported:

I have my KDE screen locker configured to "Lock screen automatically
after" 1 minute.  Sometimes it does, sometimes it doesn't.  When it
doesn't, I can lock manually with Ctrl-Alt-L.  I upgraded from 14.04 to
16.04.1 ~4 days ago, and it has stopped locking 3 or 4 times.  It was
working fine in 14.04. It's particularly annoying for me because I use
my screen saver status and my workspace name to log my hours to various
charge numbers for work.  If the screen saver isn't on, I'm logging
hours.

I wasn't sure what component to file a bug against.  I assume
libkscreenlocker5 (there is no kscreenlocker package AFAICT).

apt-cache policy libkscreenlocker5 
libkscreenlocker5:
  Installed: 5.5.5-0ubuntu1
  Candidate: 5.5.5-0ubuntu1
  Version table:
 *** 5.5.5-0ubuntu1 500
        500 http://us.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
        100 /var/lib/dpkg/status

Other info:
I've tried 5 minute locking intervals and changing the interval during the KDE 
session where locking isn't working... no change.

I've looked through all of my workspaces to see if there might be some
dialogue window or panel widget expecting user interaction that might be
disabling the timeout mechanism or something like that.  I didn't find
anything of that sort, but I just closed all windows except the firefox
window in which I'm typing this question (emacs, thunderbird, octave,
gramps, google-chrome, konsole, + ???) and the screen saver worked after
that.  I'm not sure if that was coincidence or not.  I re-opened an
instance of every app that I remember having closed and the screen saver
worked again.

This is a new Ubuntu 16.04.1 64 bit installation that was converted to
KDE by installing kde-desktop.  The user account that I'm using has its
home on another disk and that home directory has been on 12.04 and 14.04
systems.

I'm not sure if this is anyway related, but I get a "System Notification
Helper" popup window many hundreds of time per day that says "Software
upgrade notifications are available".  Perhaps that popup window is
causing the screen locker to thing there is something going on.

I'm not sure how to capture useful debugging information for something
that isn't happening.  Is there a way to query the screen locker and ask
it what it thought happened that prevented it from locking?

** Affects: ubuntu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1625441

Title:
  KDE screen lock intermittent

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