Thanks but no It did not help
I’ll try that as soon as I get a chance.
Yes it does appear to have something to do with SDDM, but sddm.conf.d contains 2 files neither of which seem to have anything to do with setting scaling or loading plasmashell.
the files are:
virtualkeyboard.conf and 00_manjaro_settings.conf
Although sddm does do Scaling among other things.
From System Settings → Startup and Shutdown → Login Screen → Apply Plasma Settings
This will make the SDDM login screen reflect your customizations to the following Plasma settings:
Screen configuration (Wayland only)
Please note that theme files must be installed globally to be reflected on the SDDM login screen.
Here’s what seems to be happening.
My login script
xrandr --output eDP-1 --scale 1.17x1.17
rescales the Screen, but has no affect on Plasma, which ‘Knows’ the the correct resolution is 1366x768, and sets itself accordingly.
The result of that is the Background image and the panel are set for a 1366x768 screen, and therefore fill approximately 2/3 rds of the Screen.
Applications on the other hand follow the screen size, but leave room for the panel, when maximised.
So there is a config setting for plasma, maybe.
Plasma can only be rescaled to 1600x900 after it has finished loading, and I run manually
plasmashell --replace &
Where upon it rescales to the full 1600x900.