XRand Optimal Size Calculator

calculator.js

// Notes about how scalling works:
// - values greater than one lead to a compressed screen
// - values less than 1 leads to zoom the screen

// Notes about screen flickering:
// - If you detect issues with screen flickering
// - Update the scaling to a number like from 1x1 to 0.9999x0.9999
// - This may force your screen to respond correctly

const global = {
    scale: 175
}

const monitors = [{
    id: 'HDMI-A-0',
    refreshRate: 60,
    scale: 175,
    x: 3840,
    y: 2160
},{
    id: 'eDP',
    refreshRate: 60,
    scale: 125,
    x: 1920,
    y: 1080
}].map((monitor, index) => {

    // Just specify the desired resolution
    const mode = monitor.x + 'x' + monitor.y

    // Scale consider the global scale
    const ratio = global.scale / monitor.scale
    const scale = ratio + 'x' + ratio

    return {
        ...monitor,
        mode,
        ratio,
        scale,
    }
}).map((monitor, index, list) => {

    // Direction is left of X, centered in Y
    const none = {x: 0, y: 0, ratio: 1}
    const last = index == 0 ? none : list[index - 1]
    const lastX = last.x ? last.x * last.ratio : 0
    const lastY = last.y ? last.y * last.ratio : 0

    const monitorX = monitor.x * monitor.ratio
    const monitorY = monitor.y * monitor.ratio

    const posX = lastX == 0 ? lastX : lastX
    const posY = lastY == 0 ? lastY : (lastY - monitorY) / 2
    const pos  = posX + 'x' + posY

    return {
        ...monitor,
        pos
    }
})

const output = 'xrandr ' + monitors.map((monitor, index) => {
    return [
        '--output', monitor.id,
        '--rate', monitor.refreshRate,
        '--mode', monitor.mode,
        '--scale', monitor.scale,
        '--pos', monitor.pos,
        (index == 0 ? '--primary' : '')
    ].join(' ')
}).join(' ')

console.log(output)

resolution.sh

#!/bin/bash

if [[ $(xrandr | grep "HDMI-A-0 connected") ]]; then
  xrandr --output eDP --rate 60 --mode 1920x1080 --scale 1.4x1.4 --pos 3840x340 --primary --output HDMI-A-0 --rate 60 --mode 3840x2160 --scale 0.9999x0.9999 --pos 0x0
else
  xrandr --output eDP --rate 60 --mode 1920x1080 --scale 1.4x1.4 --pos 0x0 --primary
fi

# Restart KDE plasma
# killall plasmashell
# sleep 1
# plasmashell --replace &