SUMMARY

I am not sure why, as it used to work - but at some point in time, kscreenlocker's "Lock screen: after waking from sleep" option stopped working. Upon wake from sleep, the desktop simply resumes on my system, regardless of my settings.


EXPECTED RESULT

Settings should be honoured; screen should successfully lock upon resume if that is what my settings are.

SOFTWARE/OS VERSIONS

Linux

Operating System: Slackware Current (ktown; mostly vanilla builds)
KDE Plasma Version: 5.18.3
KDE Frameworks Version: 5.68.0
Qt Version: 5.13.2
Kernel Version: 4.14.59
OS Type: 64-bit
Processors: 8 × Intel® Core™ i7-4710HQ CPU @ 2.50GHz
Memory: 7.7 GiB of RAM

kscreenlocker version:  5.18.3

ADDITIONAL INFORMATION

I am not running systemd. Perhaps that has something to do with it. Running ConsoleKit2 &c.

Contents of my ~/.config/kscreenlockerrc file:

***
[$Version]
update_info=kscreenlocker.upd:0.1-autolock

[Greeter]
Theme=org.kde.breeze.desktop

[Greeter][Wallpaper][org.kde.image][General]
Image=file:///usr/share/wallpapers/Next/contents/images/1366x768.png
***

I also tried manually adding:

[Daemon]
LockOnResume=true

to the configfile, and it made no difference.

Marking this as "major" as it has security (with a small "s") implications.