Nvidi agx jetpack

Hi
I have problem with the AGX Jetpack. I flashed the Nvidia AJX , but the video fails. I debug through ttyACM0 ( USB-c), the system is running and I can send commend. But there is no thing on screen.
Could you help me on this matter?
Regards

Which JetPack version you flash?
Why the video fail? How to reproduce?

If you are talking about the monitor cannot show anything, please share me the dmesg.

Please remember to have a monitor connected when dumping log.