Thank you so much for this. I had exactly the same issue - two monitors and getting an infinite LightDM login loop.
My work around:
- XFCE login (which my partner uses):I’m just going to unplug the second monitor.
- i3 login (which I use): I’ve commented out the
xrandrcommand in my i3 config (which I added to get the second monitor to display in a vertical position). I now have the second monitor back again, but obviously no longer at my preferred orientation.
Really appreciate you posting this - you’ve saved me so much time.
And of course thanks to the Manjaro devs. Lovely OS, appreciate all your hard work.