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Manage dualscreen with HiDPI

My new Dell XPS 13 has a HiDPI touchscreen and when I plug a 2nd display (not HiDPI), the resolution is big and ugly.

Solution for this is using the --scale option of xrandr!

My script example (in this case, laptop screen is at the right of my external screen):

xrandr --output eDP1 --primary --mode 3200x1800 --pos 3840x192 --rotate normal --output DP1-1 --mode 1920x1080 --pos 0x0 --rotate normal --scale 2x2