Lock Screen fails using timer

[FuLl]

I can use these:

KDE Menu's "Lock" button

or

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qdbus org.freedesktop.ScreenSaver /ScreenSaver Lock

or

"<Ctrl> + <Alt> + <L>"

...to lock the screen, but setting the timer where it says:
"Lock screen automatically after:"

...doesn't work. It used to maybe a month ago. Not sure which update broke it.

Could use a hand. TIA

[FuLl]

Is there a dependency to check or a config file that might be wrong I can maybe recreate to fix this?

[catweazel]

Is there a dependency to check or a config file that might be wrong I can maybe recreate to fix this?

In your recent posts you've told us nothing about your version of LM, and nothing about your operating environment. When you have a question where the answer clearly turns on your LM version, edition or operating system, please, at the very least, post the output of this terminal command:

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inxi -Fxz

Enclose the results between [ⅽode] and [/ⅽode] code markers by selecting </> from the mini toolbar above the textbox where you type your reply. Note that it's a capital F in that command, followed by lower case xz. You can copy the text from the terminal screen by selecting it then right-clicking.

[FuLl]

Thanks for replying, here is that output:

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$ inxi -Fxz
System:    Host: rc Kernel: 4.15.0-47-generic x86_64 (64 bit gcc: 5.4.0)
           Desktop: KDE Plasma 5.8.9 (Qt 5.6.1) Distro: Linux Mint 18.3 Sylvia
Machine:   System: Dell (portable) product: Inspiron 5559
           Mobo: Dell model: 052K07 v: A00 Bios: Dell v: 1.5.2 date: 07/18/2018
CPU:       Dual core Intel Core i7-6500U (-HT-MCP-) cache: 4096 KB
           flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 10368
           clock speeds: max: 3100 MHz 1: 2811 MHz 2: 2817 MHz 3: 2816 MHz 4: 2821 MHz
Graphics:  Card-1: Intel Skylake GT2 [HD Graphics 520] bus-ID: 00:02.0
           Card-2: Advanced Micro Devices [AMD/ATI] Sun XT [Radeon HD 8670A/8670M/8690M / R5 M330 / M430 / R7 M520]
           bus-ID: 01:00.0
           Display Server: X.Org 1.18.4 drivers: ati,radeon,intel (unloaded: fbdev,vesa)
           Resolution: 1920x1080@60.00hz, 1920x1080@60.00hz
           GLX Renderer: Mesa DRI Intel HD Graphics 520 (Skylake GT2)
           GLX Version: 3.0 Mesa 18.0.5 Direct Rendering: Yes
Audio:     Card Intel Sunrise Point-LP HD Audio driver: snd_hda_intel bus-ID: 00:1f.3
           Sound: Advanced Linux Sound Architecture v: k4.15.0-47-generic
Network:   Card-1: Intel Wireless 3160 driver: iwlwifi bus-ID: 02:00.0
           IF: wlp2s0 state: down mac: <filter>
           Card-2: Realtek RTL810xE PCI Express Fast Ethernet controller
           driver: r8169 v: 2.3LK-NAPI port: d000 bus-ID: 03:00.0
           IF: enp3s0 state: up speed: 100 Mbps duplex: full mac: <filter>
Drives:    HDD Total Size: 1506.3GB (54.3% used)
           ID-1: /dev/sda model: Crucial_CT256MX1 size: 256.1GB
           ID-2: /dev/sdb model: ST1000LM024_HN size: 1000.2GB
           ID-3: USB /dev/sdc model: nal_USB_3.0 size: 250.1GB
Partition: ID-1: / size: 235G used: 120G (54%) fs: ext4 dev: /dev/sda2
           ID-2: swap-1 size: 4.29GB used: 0.00GB (0%) fs: swap dev: /dev/sdb2
RAID:      No RAID devices: /proc/mdstat, md_mod kernel module present
Sensors:   System Temperatures: cpu: 64.0C mobo: 25.0C gpu: 55.0
           Fan Speeds (in rpm): cpu: N/A
Info:      Processes: 241 Uptime: 1 day Memory: 11464.9/15932.6MB
           Init: systemd runlevel: 5 Gcc sys: 5.4.0 Client: Shell (bash 4.3.481) inxi: 2.2.35 

There's more in KInfocenter, if any of that would help.