Unknown Graphics Controller and Display Settings are missing all resolutions above 1920x1080 and I need 3840x1600x60Hz preferably

I have Ubuntu Desktop, arm64 installed on Raspberry Pi 4b with 8Gb ram.

spinn2046@UbuntuDesktop:~$ uname -a
Linux UbuntuDesktop 5.13.0-1016-raspi #18-Ubuntu SMP PREEMPT Thu Jan 20 08:53:01 UTC 2022 aarch64 aarch64 aarch64 GNU/Linux

spinn2046@UbuntuDesktop:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 21.10
Release:    21.10
Codename:   impish

spinn2046@UbuntuDesktop:~$ sudo xrandr
Screen 0: minimum 16 x 16, current 1920 x 1080, maximum 32767 x 32767
XWAYLAND0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 880mm x 370mm
   1920x1080     59.96*+
   1440x1080     59.99  
   1400x1050     59.98  
   1280x1024     59.89  
   1280x960      59.94  
   1152x864      59.96  
   1024x768      59.92  
   800x600       59.86  
   640x480       59.38  
   320x240       59.52  
   1680x1050     59.95  
   1440x900      59.89  
   1280x800      59.81  
   720x480       59.71  
   640x400       59.95  
   320x200       58.96  
   1600x900      59.95  
   1368x768      59.88  
   1280x720      59.86  
   1024x576      59.90  
   864x486       59.92  
   720x400       59.55  
   640x350       59.77  

spinn2046@UbuntuDesktop:~$ sudo inxi -G
Graphics:  Device-1: bcm2711-hdmi0 driver: vc4_hdmi v: N/A 
           Device-2: bcm2711-hdmi1 driver: vc4_hdmi v: N/A 
           Device-3: bcm2711-vc5 driver: vc4_drm v: N/A 
           Display: server: X.Org 1.21.1.2 driver: loaded: modesetting unloaded: fbdev 
           resolution: 1920x1080~60Hz 
           OpenGL: renderer: V3D 4.2 v: 2.1 Mesa 21.2.6 

But I'm using Wayland display server. I don't know why in sudo inxi -G output there's Display: server: X.Org 1.21.1.2 displayed?

When I turn my Raspberry Pi on, I can clearly see on the purple login screen, that all display's real estate is used = all 3840x1600 pixels are lit.

But after I'll provide the password and the desktop with side panel and upper taskbar arrives, my display's resolution is decreased to 1920x1080. I'm sure Raspberry Pi can handle 2 4K displays, therefore the question is, what can I do to have this resolution available in Display Settings.

And what can I do to help Ubuntu recognize my Graphics Controller? I know, that it's integrated into main ARM CPU, but nevertheless, there should be something in there, right?