How to change the resolution of the login window in Linux Mint?

Question

linux

Hello. How to change the resolution of the login window in Linux Mint?

Answer 1

I also need such a thing, because. my monitor is 2560x1080, and the video card is old and it does not have resolutions of this format 21:9. Moreover, it still has a limit of 1920px via hdmi,
so I create my resolution 1920x810 through xrandr (i.e. with the necessary proportions of 21:9 ), about the same but Rus Z.Y.Z.Y. I did it - it worked :)
and already using the built-in monitor function, I stretch it to a maximum of 2560x1080.
now the script is launched from autostart, i.e. after logging into the system.
I think that you can try to write your own service that will start after lightdm,
but before logging into the user account and execute this script.
Systemd: Creating a Service -
Examples
added
with the last line in /usr/share/lightdm/ put the display.sh
script (you have xrandr command values ​​will be different)

display.sh

#!/bin/bash
xrandr --newmode "1920x810_75.00"  162.75  1920 2040 2240 2560  810 813 823 848 -hsync +vsync
xrandr --addmode HDMI-0 1920x810_75.00
xrandr --output HDMI-0 --mode 1920x810_75.00

if your card supports the required resolution, then you can try without these tricks.
in the display settings, set a lower resolution and press the apply system wide button ,
and only then set the desired resolution only for your profile and press apply

see screenshot