HDMI 2.0/2.1 "No Signal" Issue After TV Power Cycle

Robotics & Edge Computing Jetson Systems Jetson Orin NX
1

I am encountering an issue with HDMI display output on the Jetson Orin NX when connected to a TV. Below is a detailed description of the problem:

On initial boot, the system successfully displays the UI on the connected TV.

However, after turning the TV off and then back on, the screen displays a "No Signal" message.

The display output resumes only if I:

    Physically unplug and reconnect the HDMI cable, or

    Restart the GDM (Graphical Display Manager) service.

From a hardware perspective, we probed the HPD (Hot Plug Detect) signal and observed proper toggling behavior when the TV is power cycled, indicating that the hardware appears to be functioning correctly.

This issue is consistently observed when HDMI is configured in 2.0 or 2.1 mode. When switching to HDMI 1.4 mode, the display reliably returns after TV power cycles, without requiring any manual intervention.

Additionally, the issue seems to be more prevalent with certain TV models, suggesting some compatibility or handshake problem specific to HDMI 2.0/2.1.

Our use case requires HDMI 2.0/2.1 functionality, so we are looking for guidance or solutions to address this behavior. Has anyone else experienced similar issues, or are there any recommended workarounds or settings we should consider?

3

Is this on a custom board? Have you configured the DCE correctly?

4

Hi Wayne,

Thank you for the reply.

Yes, we are using a custom carrier board with the Jetson Orin NX. Could you please guide us on how to correctly configure the Display Control Engine (DCE) for our setup? Specifically, we’d appreciate details on the required device tree settings or any other configurations needed to ensure proper HDMI hotplug handling, particularly in HDMI 2.0/2.1 modes.

sudo cat /proc/device-tree/compatible
nvidia,p3768-0000+p3767-0001nvidia,p3767-0001nvidia,tegra234

5

please refer to the p3509 board config under Linux_for_Tegra BSP. That file includes every change you need there.

If you are using p3768 one, then that thing is configured as DP mode. Not HDMI.