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JamieKitson

Member

From: UK

Registered: 2010-10-18

Posts: 161

Website

[SOLVED] udev and xrandr doing the opposite of what it should

I have the following udev rule and script:

$ cat /etc/udev/rules.d/20-hdmi.rules 
ACTION=="change", SUBSYSTEM=="drm", ENV{DISPLAY}=":0", ENV{XAUTHORITY}="/home/jamie/.Xauthority", RUN+="/usr/bin/hdmi-plugged"

$ cat /usr/bin/hdmi-plugged 
#!/bin/bash

exec >/home/jamie/udev.out 2>&1

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

#sleep 5

/usr/bin/xrandr --output HDMI1 --auto --output eDP1 --auto --above HDMI1

The script runs when I plug my HDMI monitor in and out of my laptop, but xrandr does the opposite of what I think it should, ie, when I unplug the HDMI monitor the script turns the HDMI1 output on and when I plug the monitor in the script turns the output off. If I run the script manually it work as expected. Adding the sleep line doesn't help. I have also tried checking for the connection status and specifically setting the output on/off as appropriate, but with the same effect. It's as if the script always runs before xrandr is updated. Is there anything I can do to get the udev rule/script to run correctly?

Last edited by JamieKitson (2016-09-17 13:10:53)

JamieKitson

Member

From: UK

Registered: 2010-10-18

Posts: 161

Website

Re: [SOLVED] udev and xrandr doing the opposite of what it should

This odd workaround (ie, running xrandr before and after the sleep) from xrasengan seems to solve the issue.

Last edited by JamieKitson (2016-09-17 13:13:02)