Extend non-HiDPI external display to right of HiDPI internal display using panning method

monitor-ext-pan_fix.sh

#!/bin/bash
# extend non-HiDPI external display on DP* to right of HiDPI internal display eDP*
# see also https://wiki.archlinux.org/index.php/HiDPI
# you may run into https://bugs.freedesktop.org/show_bug.cgi?id=39949
#                  https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/883319
SCALE=2
EXT=`xrandr --current | sed 's/^\(.*\) connected.*$/\1/p;d' | grep -v ^eDP | head -n 1`
INT=`xrandr --current | sed 's/^\(.*\) connected.*$/\1/p;d' | grep -v ^DP | head -n 1`
ext_w=`xrandr | sed 's/^'"${EXT}"' [^0-9]* \([0-9]\+\)x.*$/\1/p;d'`
ext_h=`xrandr | sed 's/^'"${EXT}"' [^0-9]* [0-9]\+x\([0-9]\+\).*$/\1/p;d'`
int_w=`xrandr | sed 's/^'"${INT}"' [^0-9]* \([0-9]\+\)x.*$/\1/p;d'`
int_h=`xrandr | sed 's/^'"${INT}"' [^0-9]* [0-9]\+x\([0-9]\+\).*$/\1/p;d'`

xrandr --output $INT --auto --output $EXT --auto --panning $(($ext_w*2))x$(($ext_h*2))+${int_w}+0 --scale ${SCALE}x${SCALE} --right-of $INT

Using panning method to get around xserver bug where mouse does not reach the whole screen.

• https://wiki.archlinux.org/index.php/HiDPI#Multiple_displays

Does your mouse flicker on the built in display?