Jetson Xavier NX Limited/Full HDMI Range

I have a Xavier unit that can see changes in rgb color range and report limited or full.

When I use a PC as my source I can see the change on the HDMI input to my Xavier unit.

But when I use another Xavier as input I never see any range other than limited.

I’m using the recommend way by changing X11 server config to switch between limited or full.

Section “Device”
Identifier “Tegra0”
Driver “nvidia”
Option “AllowEmptyInitialConfiguration” “true”
Option “ColorSpace” “RGB”
Option “ColorRange” “Full”
EndSection

or

Section “Screen”
Identifier “Default Screen”
Device “Tegra0”
Monitor “Monitor0”
DefaultDepth 24
Option “AllowEmptyInitialConfiguration” “true”
Option “ColorSpace” “RGB”
Option “ColorRange” “Limited”
SubSection “Display”
Depth 24
Modes “nvidia-auto-select”
EndSubSection
EndSection

Thanks in advance