Screen resolution on Startup

Support Graphics & Display
1

Hi, I just got 2 new 27" monitors.
Both are running fine during operations, but when I boot the system I get a message from one of monitors, stating the current resolution is set to 3840x2160 instead of the recommend of 2560x1440.
The other doesn’t display show that message and has the proper resolution on launch.

I have tried this solution: ‘Resolution of login screen customizable - #2 by Mirdarthos’, but that didn’t work.
I’ve looked at the sddm.config, but didn’t find a way to set resolution.

Operating System: Manjaro Linux 
KDE Plasma Version: 5.27.8
KDE Frameworks Version: 5.110.0
Qt Version: 5.15.10
Kernel Version: 6.1.55-1-MANJARO (64-bit)
Graphics Platform: X11
Processors: 8 × Intel® Core™ i7-4790 CPU @ 3.60GHz
Memory: 15.6 GiB of RAM
Graphics Processor: NVIDIA GeForce GTX 760/PCIe/SSE2
Manufacturer: MSI
Product Name: MS-7821
System Version: 1.0

xrandr returns:

Screen 0: minimum 8 x 8, current 5120 x 1440, maximum 16384 x 16384
DVI-I-0 disconnected (normal left inverted right x axis y axis)
DVI-I-1 disconnected (normal left inverted right x axis y axis)
HDMI-0 connected primary 2560x1440+2560+0 (normal left inverted right x axis y axis) 600mm x 340mm
   3840x2160     59.94 +  50.00    29.97    25.00    23.98  
   2560x1440     59.95* 
   1920x1080    119.88    60.00    59.94    50.00  
   1280x720      59.94    50.00  
   1024x768      60.00  
   800x600       60.32  
   720x576       50.00  
   720x480       59.94  
   640x480       59.94    59.93  
DP-0 disconnected (normal left inverted right x axis y axis)
DVI-D-0 disconnected (normal left inverted right x axis y axis)
DP-1 connected 2560x1440+0+0 (normal left inverted right x axis y axis) 600mm x 340mm
   2560x1440    120.00*+  99.95    59.95  
   1920x1080    119.88   100.00    60.00    59.94    50.00  
   1280x720      59.94    50.00  
   1024x768      60.00  
   800x600       60.32  
   720x480       59.94  
   640x480       59.94    59.93

I’m pretty sure I can set the screen with xrandr, but I’m unsure how, because as far as I’m aware this is for the setup during running operations.
And I haven’t found a page where the xrandr output is fully explained.

Best,
Edward

2

Is the resolution correct, despite the apparent error message?

Update:- The following appears to be the same (or similar) to the issue you’re experiencing – Solved, as indicated in the thread:

Cheers.

3

The correct resolution is 2560*1440.

I can’t recreate the post you have linked, as it is for xfce and Plasma looks different and I don’t see an advanced option.

4

Yes. That doesn’t answer the question asked.

Yes, it is.
I didn’t read much beyond the title. That’s your job.

5

Yes, I did read the instructions, but can’t map them to Plasma. The interfaces are to dissimilar.
I’ll keep searching.

6

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