Hi Wayne,
Update the status.
The issue looks like that isn’t depend on Dell monitor.
It’s happended 100% in that day. But it become intermittent when we want to duplicate again.
And we check it happend on Orin Nano too. (Orin Nano 8GB + Xaviver Devkit, p3509-a02+p3767-0000.conf)
It looks like same as the post .
[ WARNING occurs when plugin/out HDMI in OrinNX]
If it’s not depend on Dell monitor. Do you need to the signal on HDMI_DDC, HPD and HDMI_EN pins status too?