LibGDX fullscreen sizes

Question

I have tested a few values (by setting LwjglApplicationConfiguration width and height) to these values:

1920 | 1080
1024 | 768
 800 | 600

But I'm not able to get below those values while setting the fullscreen mode on.

So, what are the supported fullscreen sizes for libGDX?

EDIT 1: this is the source code trying to create new application with resolution of 600|480

public class Main {
    public static void main(String args[]) {
        LwjglApplicationConfiguration cfg = new LwjglApplicationConfiguration();
        cfg.title = "Asteroid";
        cfg.width = 600;
        cfg.height = 480;
        cfg.resizable = false;
        cfg.fullscreen = true;

        new LwjglApplication(new Game(), cfg);
    }
}

Which throws the following error:

Exception in thread "LWJGL Application" com.badlogic.gdx.utils.GdxRuntimeException: Couldn't set display mode 600x480, fullscreen: true
at com.badlogic.gdx.backends.lwjgl.LwjglGraphics.setupDisplay(LwjglGraphics.java:131)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication.mainLoop(LwjglApplication.java:131)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication$1.run(LwjglApplication.java:114)

On the other hand, similar code like this:

public class Main {
    public static void main(String args[]) {
        LwjglApplicationConfiguration cfg = new LwjglApplicationConfiguration();
        cfg.title = "Asteroid";
        cfg.width = 800;
        cfg.height = 600;
        cfg.resizable = false;
        cfg.fullscreen = true;

        new LwjglApplication(new Game(), cfg);
    }
}

Works without problem.

Answer 1

You're trying to change the resolution of your monitor to something smaller than your monitor supports. Instead of changing the actual resolution of your monitor, you should simply use a viewport with whatever resolution you want.