I'm used to create a "retina" resolution using GNOME (my display is 2k and I use the 4k resolution scaled to 2K), but I really prefer KDE over it. I was unable to make xrandr work properly using NVIDIA 1060 or Intel 630 when I run the xrandr command it works but the KDE interface only runs minimized in 25% or a little more of the screen and 75% is black (probably this is the issue that some people call "mouse trapping").

The command that I use at GNOME is:
xrandr --output connected_display --panning 3840x2160 --scale 1.5x1.5 and it works perfectly.

I also tried to use the --fb option but the issue persists.

https://forum.manjaro.org/uploads/default/original/3X/5/1/51c652e5f664aece653f04bf6654003b09ddad4b.png

(Tried Ubuntu, Arch and Debian distros with latest KDE)

~ >>> mhwd -li

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> Installed PCI configs:
--------------------------------------------------------------------------------
                  NAME               VERSION          FREEDRIVER           TYPE
--------------------------------------------------------------------------------
    video-nvidia-440xx            2019.10.25               false            PCI

inxi -SCMGaxxxz

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Graphics:  Device-1: NVIDIA GP106 [GeForce GTX 1060 6GB] vendor: ASUSTeK driver: nvidia v: 440.36
           bus ID: 01:00.0 chip ID: 10de:1c03
           Display: x11 server: X.Org 1.20.6 driver: nvidia compositor: kwin_x11
           resolution: 2560x1440~60Hz
           OpenGL: renderer: GeForce GTX 1060 6GB/PCIe/SSE2 v: 4.6.0 NVIDIA 440.36
           direct render: Yes

KDE xrandr without running the script:

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connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 526mm x 296mm
   2560x1440     59.95*+
   2048x1080     60.00    24.00 
   1920x1200     59.88 
   1920x1080     60.00    59.94    50.00    23.98 
   1680x1050     59.95 
   1600x1200     60.00 
   1280x1024     75.02    60.02 
   1280x800      59.81 
   1280x720      59.94    50.00 
   1152x864      75.00 
   1024x768      75.03    60.00 
   800x600       75.00    60.32 
   720x576       50.00 
   720x480       59.94 
   640x480       75.00    59.94    59.93

KDE after running the script:

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Screen 0: minimum 8 x 8, current 3840 x 2160, maximum 32767 x 32767

connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 526mm x 296mm
   2560x1440     59.95*+
   2048x1080     60.00    24.00 
   1920x1200     59.88 
   1920x1080     60.00    59.94    50.00    23.98 
   1680x1050     59.95 
   1600x1200     60.00 
   1280x1024     75.02    60.02 
   1280x800      59.81 
   1280x720      59.94    50.00 
   1152x864      75.00 
   1024x768      75.03    60.00 
   800x600       75.00    60.32 
   720x576       50.00 
   720x480       59.94 
   640x480       75.00    59.94    59.93 

GNOME using the script:

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Screen 0: minimum 8 x 8, current 3840 x 2160, maximum 32767 x 32767
connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 526mm x 296mm
   2560x1440     59.95*+
   2048x1080     60.00    24.00 
   1920x1200     59.88 
   1920x1080     60.00    59.94    50.00    23.98 
   1680x1050     59.95 
   1600x1200     60.00 
   1280x1024     75.02    60.02 
   1280x800      59.81 
   1280x720      59.94    50.00 
   1152x864      75.00 
   1024x768      75.03    60.00 
   800x600       75.00    60.32 
   720x576       50.00 
   720x480       59.94 
   640x480       75.00    59.94    59.93

Any hints? Thank you very much!