Updated inxi:

Graphics:
  Device-1: Advanced Micro Devices [AMD/ATI] Vega 20 [Radeon VII]
    driver: amdgpu v: kernel arch: GCN-5 pcie: speed: 8 GT/s lanes: 16 ports:
    active: DP-3 empty: DP-1,DP-2,HDMI-A-1 bus-ID: 0c:00.0 chip-ID: 1002:66af
    class-ID: 0300
  Display: unspecified server: X.org v: 1.21.1.18 driver: X:
    loaded: modesetting unloaded: fbdev dri: radeonsi gpu: amdgpu display-ID: :0
    screens: 1
  Screen-1: 0 s-res: 3840x2160 s-size: <missing: xdpyinfo>
  Monitor-1: DP-3 model: LG (GoldStar) ULTRAGEAR+ serial: <filter> res: N/A
    dpi: 140 size: 697x392mm (27.44x15.43") diag: 800mm (31.5") modes:
    max: 3840x2160 min: 640x480
  API: EGL v: 1.5 hw: drv: amd radeonsi platforms: device: 0 drv: radeonsi
    device: 1 drv: swrast gbm: drv: kms_swrast surfaceless: drv: radeonsi x11:
    drv: radeonsi inactive: wayland
  API: OpenGL v: 4.6 compat-v: 4.5 vendor: amd mesa v: 25.2.4 glx-v: 1.4
    direct-render: yes renderer: AMD Radeon VII (radeonsi vega20 ACO DRM 3.61
    6.12.51) device-ID: 1002:66af
  Info: Tools: api: clinfo, eglinfo, glxinfo x11: xprop,xrandr

$ xrandr --listmonitors      
Monitors: 1
 0: +DP-3 3840/697x2160/392+0+0  DP-3

$ xrandr --listactivemonitors
Monitors: 1
 0: +DP-3 3840/697x2160/392+0+0  DP-3

Also:

$ xrandr --listproviders     
Providers: number : 1
Provider 0: id: 0x48 cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 6 outputs: 4 associated providers: 0 name:modesetting