Cannot change screen resolution in X11

Thanks! But I’d like to know whether this does not work automatically in EndeavourOS, as I said, it works in Kubuntu: xrandr finds all the resolutions… So I’d like to understand why.

The differences I found up to now are with inxi -G.

This is EndeavourOS:

Graphics:
  Device-1: Intel TigerLake-LP GT2 [Iris Xe Graphics] driver: i915 v: kernel
  Device-2: Realtek LG Camera type: USB driver: uvcvideo
  Display: x11 server: X.Org 1.21.1.3 driver: loaded: intel
    unloaded: modesetting resolution: 2560x1600~60Hz
  OpenGL: renderer: Mesa Intel Xe Graphics (TGL GT2) v: 4.6 Mesa 21.3.4

while this is Kubuntu:

Graphics:  Device-1: Intel TigerLake-LP GT2 [Iris Xe Graphics] driver: i915 v: kernel 
           Device-2: Realtek LG Camera type: USB driver: uvcvideo 
           Display: x11 server: X.Org 1.20.13 driver: loaded: modesetting unloaded: fbdev,vesa 
           resolution: 2560x1600~60Hz 
           OpenGL: renderer: Mesa Intel Xe Graphics (TGL GT2) v: 4.6 Mesa 21.2.2 

besides the different X.Org version, I see that Kubuntu has driver: loaded: modesetting, while EndeavourOS has driver: loaded: intel unloaded: modesetting. So is this a driver problem? Maybe that’s related to this Troubles with screenshots - #3 by lorebett that is xf86-video-intel? Is there a way to force modesetting instead of intel?

Thanks again in advance