[SOLVED] How can I toggle monitor layout using a Bash script with xrandr on KDE Plasma?

How can I toggle monitor layout using a Bash script with xrandr on KDE Plasma?

I'm running KDE Plasma on a laptop with a built-in screen and an external monitor. I want to write a Bash script that toggles the layout of my external monitor (HDMI-A-1) between:

Above the laptop screen (eDP-1)
To the right of the laptop screen

I'm using xrandr, and here's the relevant output from xrandr --verbose | grep -E 'connected|[0-9]+x[0-9]+\+[0-9]+\+[0-9]+'

eDP-1 connected primary 1920x1080+0+1080 (0x25) normal (normal left inverted right x axis y axis) 293mm x 165mm
HDMI-A-1 connected 1920x1080+0+0 (0x25) normal (normal left inverted right x axis y axis) 531mm x 299mm

the other lay out (on the right):

eDP-1 connected primary 1920x1080+0+0 (0x25) normal (normal left inverted right x axis y axis) 293mm x 165mm
HDMI-A-1 connected 1920x1080+1920+0 (0x25) normal (normal left inverted right x axis y axis) 531mm x 299mm

Based on that, I'm checking the position of eDP-1 to determine the layout and using xrandr to switch between them. Here's my current script:

#!/bin/bash

PRIMARY="eDP-1"
SECONDARY="HDMI-A-1"
PRIMARY_POS=$(xrandr --query | grep "^$PRIMARY connected" | grep -oP '\+\d+\+\d+')

if [[ "$PRIMARY_POS" == "+1080+0" ]]; then
    xrandr --output "$SECONDARY" --off
    xrandr --output "$SECONDARY" --auto --above "$PRIMARY"
elif [[ "$PRIMARY_POS" == "+0+0" ]]; then
    xrandr --output "$SECONDARY" --off
    xrandr --output "$SECONDARY" --auto --right-of "$PRIMARY"
else
    xrandr --output "$SECONDARY" --off
    xrandr --output "$SECONDARY" --auto --right-of "$PRIMARY"
fi

This just ends up failing with:

X Error of failed request:  BadMatch (invalid parameter attributes)

This also happens when using arandr to generate the scripts.

I suspect it has something to do with KDE’s own screen configuration tools getting in the way. Is there a better or more reliable way to do this with xrandr, or should I be using a KDE-specific tool instead?

Any tips for making this script more robust — or KDE-friendly — would be appreciated!

Solution

xrandr does not work reliable on Wayland, it seems. Try wlr-randr, gnome-randr, kanshi, wdisplays or kscreen-doctor...