Arch Linux

BozanicJosip

Member

Registered: 2020-05-11

Posts: 10

Automatic monitor configuration on udev trigger

Hi guys,

I've just installed Arch a couple of days ago alongside i3wm and I'm enjoying it a lot. One thing though that I can't really set up after countless hours is an automatic monitor configuration when I connect my HDMI port. I would really like to know what is wrong with my setup before I move to a different solution.

So pretty much the setup is pretty straightforward. I've created a udev rule:

KERNEL=="card0", SUBSYSTEM=="drm", ACTION=="change" RUN+="su bozanicjosip -c usr/local/bin/hotplug-monitor"

The script that I'm running is

export DISPLAY=:0
export XAUTHORITY=/home/bozanicjosip/.Xauthority

hdmi_status="$(cat /sys/class/drm/card0-HDMI-A-2/status)"
/usr/bin/notify-send --urgency low -t 5000 "Graphics Update" "HDMI plugged in"

function connect(){
	/usr/bin/xrandr --output HDMI2 --auto --right-of eDP1 
	/usr/bin/notify-send --urgency low -t 5000 "Graphics Update" "HDMI plugged in"
}

function disconnect(){
	/usr/bin/xrandr --output HDMI2 --off
}

function default(){
	/usr/bin/xrandr --auto
}

if [ "${hdmi_status}" = connected ]; then
	connect
elif [ "${hdmi_status}" = disconnected ]; then
	disconnect
else default
fi

So basically when I run the script it works, but when it's triggered through udev rule It works only when the monitor is disconnected and not when it's connected. Also the notification doesn't work. One indication where the problem could be is also that the same thing happens when I run it with sudo.

I was logging the script at one point and what I noticed is that the status was connected, but when I would call the xrandr from the script my HDMI2 port would say disconnected. Any ideas what I'm doing wrong here?

Thanks