need to change GDM3 login screen resolution

[jfaberna]

I can find lots on hits on this subject, but none seem to be right for Ubuntu 20.04.2

I have a 4K monitor with the scale factor set to 200% so it viewable for me but still allows 4K pictures and videos to be viewed correctly.

However, this has no effect on the login screen. It's still way too small. How can I tell gdm3 to scale or use HiDPI?

[deadflowr]

Which things have you tried?
So no one posts repeat failures and wastes both their's and your time.

[jfaberna]

Which things have you tried?
So no one posts repeat failures and wastes both their's and your time.

https://askubuntu.com/questions/9120...een-resolution
goes back to 17.04 and I'd looked at what they pointed to and those files didn't exist on 20.04.

I know that Kubuntu 20.04 has a login setting and you can choose sync and that works, but I have not found any settings for GDM3 that compare to SDDM.

[deadflowr]

Look at this then:
https://askubuntu.com/questions/9067...-hidpi-display

[jfaberna]

Look at this then:
https://askubuntu.com/questions/9067...-hidpi-display

Thanks, that helped. The specific steps I did were:

sudo nano /usr/share/glib-2.0/schemas/org.gnome.desktop.interface.gschema.xml

1.change the default in the code block to '2' as listed below:

    <key name="scaling-factor" type="u">
      <default>2</default>
      <summary>Window scaling factor</summary>
      <description>
        Integer factor used to scale windows by. For use on high-dpi screens.
        0 means pick automatically based on monitor.
      </description>
    </key>

2. run the following command.

sudo glib-compile-schemas /usr/share/glib-2.0/schemas

3. reboot