Please check if this tutorial helps:
When having multple monitors on system boot, your Display Manager (SDDM, LightDM, GDM etc) will usually not display correctly in respect to your configured Xorg settings, if not configured properly.
To fix this, a popular and fairly proper and easy method is to use an Xsetup script for your Display Manager.
Xsetup script is a script (executable) file that includes some instructions to the Xorg server, just before starting the Display Manager
Here arre these settings for SDDM, while they can…
It is strange indeed that the issue is occurring only now, of course.
In my opinion it could be an issue due to the recent long-awaited sddm update to release 0.20.
Anyway, just give it a try if you want.
I’ve seen also this similar old (again, strange) sddm issue:
opened 02:05PM - 27 Jun 21 UTC
bug
multi-monitor
SUMMARY
When i power my netbook and i go to login, it show overlapping login … screens. It show 3 screen, 1 on monitor netbook and 2 on my external monitor (overloop).
I have a notebook (MSI GS75-8SE) connect to a external monitor (LG 34GN850-B). I have disable monitor notebook and i only use external monitor. Once i login in, all work good, the external monitor is ok and my monitor notebook is off.
My card is Nvidia RTX2060 and my connection to monitor is by Thunderbolt.
MY SYSTEM
Linux/KDE Plasma: KDE Neon 20.04
KDE Plasma Version: 5.22.2
KDE Frameworks Version: 5.83.0
Qt Version: 5.15.3
I attach a captu
![IMG_20210408_091105](https://user-images.githubusercontent.com/22059282/123547529-6f0f3800-d761-11eb-875a-d7498b630406.jpg)
re.
but it’s unsolved…
Actually, a comment from an Arch user links (as solution) to this Arch Wiki article/chapter:
https://wiki.archlinux.org/title/SDDM#Overlapping_greeters_on_multiscreen_setup
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