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How to achieve proper scaling for screens: 3200x1800 and 2560x1440 using xrandr?


I bought Dell XPS 13 laptop with 3200x1800 screen resolution and an external monitor with 2560x1440 screen resolution. External monitor looks awfully (everything is too large) with fedora25-Wayland, so I changed the desktop to Gnome Xorg.
I tried different combination with xrandr (following these instructions, but it always ended with a failure (both displays always reacted on changes, but in the undesirable way: the cursor disappeared outside the screen; display was displaying only half screen etc).
What I tried:
DP-1 - 2560x1440
eDP-1 - 3200x1800
$ xrandr --output eDP-1 --auto --output DP-1 --auto --scale 1.4x1.4 --right-of eDP-1
$ xrandr --output eDP-1 --auto --output DP-1 --auto --panning 3584x5216 --scale 1.4x1.4 --right-of eDP-1
$ xrandr --output eDP-1 --auto --pos 0x2016 --output DP-1 --scale 1.4x1.4 --auto --pos 0x0 --fb 3584x3816
etc.

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How to achieve proper scaling for screens: 3200x1800 and 2560x1440 using xrandr?

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