Public bug reported:

Hello!

I use ubuntu 18.04. 
Kernel Ubuntu 4.15.0-73.82+lp1854798+2-generic 4.15.18 (problem exists on 
previous kernels too)
KDE from the repo
Screen is extended to external monitor
laptop Lenovo Carbon 6x
Monitor attached with HDMI 
Monitor model: Acer H236HL

When the screen is locked by timeout, after unlocking by entering
password, KDE panel disappears on external monitor. I can not add a
panel to it, e.g. I add it to screen but the panel does not appear.
After reboot panel is in place. If I have added panels to screen they
are also exist.

It is interesting that this problem exists with only my monitor. Other
monitors attached to my laptop work OK. The problem also does not exist
if I turn my monitor off before screen lock.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1857418

Title:
  KDE Panel disappears after screen lock

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