set_hidpi.sh

#!/bin/bash

# if the notebook lid is closed the the display is identified as "DisplayPort-0". If the notebook lid is open it is identified as "DisplayPort-1"
# in case of a closed lid "DisplayPort-1 disconnected" can be found in xrandr output.

# default to notebook lid is open
TARGET_DISPLAY="DisplayPort-1"

xrandr | grep 'DisplayPort-1 disconnected' > /dev/null
if [ "$?" == 0 ]; then
    # disconnected was found so we need to use "DisplayPort-0" instead 
    TARGET_DISPLAY="DisplayPort-0"
fi

xrandr | grep '4096x2160_50'
if [ "$?" != "0" ]; then
    xrandr --newmode "4096x2160_50" 526.170  4096 4632 4696 4736  2160 2208 2216 2222 +hsync +vsync || exit 1
    xrandr --addmode $TARGET_DISPLAY 4096x2160_50 || exit 1
fi

xrandr | grep '4096x2160_60'
if [ "$?" != "0" ]; then
    xrandr --newmode "4096x2160_60" 556.730  4096 4104 4136 4176  2160 2208 2216 2222 +hsync +vsync || exit 1
    xrandr --addmode $TARGET_DISPLAY 4096x2160_60 || exit 1
fi

# set HiDPI resolution by setting to highest possible resolution and changing text-scaling-factor
xrandr -s 4096x2160_60 || exit 1

TEXT_SCALE_FACTOR=$(gsettings get org.gnome.desktop.interface text-scaling-factor)
if [ "$TEXT_SCALE_FACTOR" != "1.5" ]; then
    gsettings set org.gnome.desktop.interface text-scaling-factor 1.5 || exit 1
fi