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To fight with dual-monitor resolution problems, I followed the advice found in other questions here related to session- and display-setup-script. I have the following /etc/lightdm/lightdm.conf:

[SeatDefaults]
user-session=ubuntu
greeter-session=unity-greeter
allow-guest=false
display-setup-script=/usr/bin/dualmon.sh
session-setup-script=/usr/bin/dualmon.sh

I also have the following (executable) /usr/bin/dualmon.sh that I created:

#!/bin/bash

xrandr --output LVDS1 --auto --left-of HDMI1 --output HDMI1 --auto
# notify-send Dualscreen activated

touch /home/shade/Desktop/touched

However, the resolution is wrong both at the login screen and after I log in. Also, the file /home/shade/Desktop/touched is not there. When I run the dualmon.sh script manually (after I log in), the resolution is set correctly.

This makes me think that the scripts are not run at all. What is the cause of this and how can I fix it?

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1 Answer

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Have you checked the file permissions? You need to make sure that it's executable by a root user. This post should help.

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It's executable for all users. I can execute the script both with my user and suid. – Shade Apr 8 at 15:07
Just for fun, does it execute the display-setup-script when you switch the two? I've got a config where it executes the display-setup-script but then ignores the following session-setup-script. – J.T. Blum Apr 9 at 17:15

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