https://bugs.kde.org/show_bug.cgi?id=445680

--- Comment #1 from Sławek <sla...@kaplonski.pl> ---
I just hit this issue again after login into the desktop. Here is output of the
kscreen-doctor when resolution was broken:

kscreen-doctor -o
Output: 1 unknown eDP-1-unknown disabled connected  Panel Modes:
0:1920x1080@60*! Geometry: 0,0 1920x1080 Scale: 1 Rotation: 1 Overscan: 0 Vrr:
incapable RgbRange: Automatic 
Output: 2 Goldstar Company Ltd LG HDR 4K/345575 enabled connected primary
Unknown Modes: 0:3840x2160@30 1:2560x1440@60 2:1920x1080@60 3:1920x1080@60
4:1920x1080@60 5:1600x900@60 6:1280x1024@60 7:1280x800@60 8:1280x720@60
9:1280x720@60 10:1280x720@60 11:1024x768@60 12:800x600@60 13:720x480@60
14:720x480@60 15:640x480@60 16:640x480@60 17:640x480@60 18:3840x2160@60*!
Geometry: 0,0 2560x1440 Scale: 1.5 Rotation: 1 Overscan: 0 Vrr: incapable
RgbRange: Automatic primary


Then I run kscreen-doctor to fix it:
kscreen-doctor output.1.disable output.2.enable output.2.mode.3840x2160@60
output.2.scale.1.5

but it changed nothing. So I run:
kscreen-doctor output.1.disable output.2.enable output.2.mode.1280x800@60

which changed resolution to 1280x800 and fixed desktop that whole (huge)
desktop was displayed and mouse coursor was working properly.

Then I again run 
kscreen-doctor output.1.disable output.2.enable output.2.mode.3840x2160@60
output.2.scale.1.5

And I have fixed my desktop finally :)

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