Bug ID: 423545
           Summary: Repeating images and bad scaling on 2nd monitor
           Product: kwin
           Version: git master
          Platform: openSUSE RPMs
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: wayland-generic
  Target Milestone: ---

When I use my 4K monitor as a second monitor for my laptop (has a 1920x1080
screen), the 4K monitor will appear to be zoomed in 2x (right half of what
should be visible is cut off) whether I'm using UI scaling or not.

The screen will also repeat the movements of previously rendered UIs that were
shown on the 2nd monitor when any part of a UI updates, including non-Qt apps
like Firefox. For instance, the broken images will continue to move whenever I
hover over a UI element, whenever the text cursor blinks, when ever I type a
letter or whenever I move a window.

1. Log into the "Plasma (Wayland)" or "Plasma (Full Wayland)" session
2. Move a window to the 2nd screen

Operating System: openSUSE Tumbleweed 20200621
KDE Plasma Version: 5.19.80
KDE Frameworks Version: 5.72.0
Qt Version: 5.15.0
Kernel Version: 5.7.2-1-default
OS Type: 64-bit
Processors: 4 × Intel® Core™ i7-6500U CPU @ 2.50GHz
Memory: 7.6 GiB of RAM
Graphics Processor: Mesa DRI Intel® HD Graphics 520

My monitor is an LG 27UK650-W

2x UI scaling just results in UIs that are 2x larger, but the screen still
looks zoomed in 2x.


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