I tried using an HDMI cable to connect Jetson Nano Developer Kit to a monitor, which doesn’t have a power chord connected. But the monitor can still be detected. It is listed with “xrandr --listmonitors”, and its EDID can be correctly read from /sys/kernel/debug/tegradc.0/edid.
“The EDID PROM can often be read by the host PC even if the display itself is turned off.”
Ideally I would like the monitor to be considered as non-exist unless it is powered on. Is it possible?