Xorg.log:
[174115.009] (**) NVIDIA(0): Using HorizSync/VertRefresh ranges from the EDID for display
[174115.009] (**) NVIDIA(0): device Ancor Communications Inc ASUS PB287Q (DFP-2) (Using
[174115.009] (**) NVIDIA(0): EDID frequencies has been enabled on all display
[174115.009] (**) NVIDIA(0): devices.)
[174115.025] (**) NVIDIA(0): Using HorizSync/VertRefresh ranges from the EDID for display
[174115.025] (**) NVIDIA(0): device Ancor Communications Inc ASUS PB287Q (DFP-4) (Using
[174115.025] (**) NVIDIA(0): EDID frequencies has been enabled on all display
[174115.025] (**) NVIDIA(0): devices.)
[174126.587] (II) NVIDIA(0): Setting mode "DP-0: nvidia-auto-select @3840x2160 +0+0 {ViewPortIn=3840x2160, ViewPortOut=3840x2160+0+0}"
[174126.981] (**) NVIDIA(0): Using HorizSync/VertRefresh ranges from the EDID for display
[174126.981] (**) NVIDIA(0): device Ancor Communications Inc ASUS PB287Q (DFP-4) (Using
[174126.981] (**) NVIDIA(0): EDID frequencies has been enabled on all display
[174126.981] (**) NVIDIA(0): devices.)
[174127.788] (II) NVIDIA(0): Setting mode "DP-0: nvidia-auto-select @3840x2160 +0+0 {ViewPortIn=3840x2160, ViewPortOut=3840x2160+0+0}, DP-2: nvidia-auto-select @3840x2160 +3840+0 {ViewPortIn=3840x2160, ViewPortOut=3840x2160+0+0}"