Orin Nano cannot shut down if the CPU is overheating

[ruei_chang]

Hi Nivida team,

I’m encountering a problem where I can’t properly shut down my machine. If my CPU is operating around 50–60 degrees Celsius, I can shut it down 100% with no problem. However, if my CPU is operating around 80–90 degrees Celsius, I am unable to shut it down properly. (Because the MOD_SLEEP doesn’t become low level, it’s still at high level)

I am using the Orin Nano in an HDMI configuration.Does the HDMI configuration of the Orin Nano have a power-off issue if the SOM is overheating?

Here is the message I receive on the debug port when executing the poweroff command.The output looks the same, and I have no clue what is wrong. What else I can do to find out the root cause?

BTW, if I changed back to DP configuration, there is no problem when executing poweroff.

poweroffokay.txt (7.4 KB)

powerofffail.txt (7.5 KB)

My JP version is 6.2.  Orin Nano with our custom board, not devkit.

root@tegra-ubuntu:/home/ubuntu# cat /etc/nv_tegra_release
# R36 (release), REVISION: 4.3, GCID: 38968081, BOARD: generic, EABI: aarch64, DATE: Wed Jan  8 01:49:37 UTC 2025
# KERNEL_VARIANT: oot
TARGET_USERSPACE_LIB_DIR=nvidia
TARGET_USERSPACE_LIB_DIR_PATH=usr/lib/aarch64-linux-gnu/nvidia

[ruei_chang]

Sorry NV team,

I have found the root cause; it is a hardware issue. I memasured the SHUTDOWN_REQ voltage. If the machine can shut down successfully, the SHUTDOWN_REQ voltage drops from 5V to 1.68V. However, if the machine fails to shut down, the voltage drops from 5V to 0V.

I need to check with the hardware team why this is happening.