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So I used this workaround to sort my resolution at the login screen when using multiple monitors with Lightdm.

#!/bin/bash

XCOM0=`xrandr -q | grep 'VGA1 connected'`
XCOM1=`xrandr --output LVDS1 --primary --auto --output VGA1 --auto --right-of LVDS1`
XCOM2=`xrandr --output LVDS1 --primary --auto`
# if the external monitor is connected, then we tell XRANDR to set up an extended desktop
if [ -n "$XCOM0" ] || [ ! "$XCOM0" = "" ]; then echo $XCOM1
# if the external monitor is disconnected, then we tell XRANDR to output only to the laptop screen
else echo $XCOM2
fi

exit 0;

Found Here: How to force Multiple Monitors correct resolutions for LightDM?

It works great.

However, now when I am on my login screen, the login box seems to jump to between the two displays. Any advice as to how I could make it stay on one display?

Thanks

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