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I am currently trying to find a solution to make my HiDPI Laptop screen work with an ultrawide non-HiDPI as an external monitor on GNOME. I have read a lot and what I understand about the basic concept is: Create a virtual large desktop and "place" both monitors with acceptable scalings on it.

But when I set the framebuffer with xrandr the complete desktop breaks and it only shows vertical/horizontal fragments.

My setup:

  • GNOME set to scaling factor of 2
  • Displays:
    1. Notebook with 2560x1440 at 1.25x1.25 scaling
    2. External with 3440x1440 at 2x2 scaling placed at the top left of the NB screen

My math:

  • Scaled NB display should be 3200x1800
  • Scaled ext. display should be 6880x2880
  • = Framebuffer of 10080x2880

Used command: xrandr --output DP1-1 --auto --scale 2x2 --pos 0x0 --output eDP1 --auto --scale 1.25x1.25 --pos 6880x1080 --fb 10080x2880

Result (screenshot scaled down): Broken result

Is my command missing something important or what am I doing wrong?

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