How to change the resolution in SDDM

[ArchStanton]

When using a laptop with a 4K screen, SDDM is very small and hard to see. Once I login, I have the resolution set to 1920x1080 and everything looks good.

I’ve tried going into SDDM settings and clicked “Apply Plasma Settings” and that didn’t work. I also tried enabling HiDPI and that didn’t work either.

Does anyone have any other suggestions?

[petsam]

@ArchStanton

Does anyone have any other suggestions?

You may use an xrandr command to set SDDM display properties.

Change Display priority (KDE/Lightdm)

If you are confident that this command will always work (monitor output names randomly change), then create an executable script with this command, and set it as display-setup-script= value in the [Seats.*] section of /etc/lightdm/lightdm.conf. Test it well, and be prepared for a black screen, just in case… (switch to TTY and rename the file). Plasma has done a lot of progress with multi-monitors, so maybe you try the available options in System Settings/Display, before using the above (if li…

Use SDDM relevant configuration.
Read the tip in this section.

[ArchStanton]

I was able to do it using the xrandr command, thanks.