Jetson Orin Nano dmesg error about minRequiredIsoBandwidthKBPS

Issue Overview

Users of the Nvidia Jetson Orin Nano Dev board have reported encountering a specific error message during the reboot process, which appears in the system logs (dmesg). The error reads:

NVRM nvAssertFailedNoLog: Assertion failed: minRequiredIsoBandwidthKBPS <= clientBwValues[DISPLAY_ICC_BW_CLIENT_EXT].minRequiredIsoBandwidthKBPS @ kern_disp_0402.c:111

Symptoms and Context

• Symptoms: The primary symptom is the appearance of the above error message in the dmesg logs. However, users have noted that HDMI functionality remains unaffected, indicating that the system operates normally despite the log entry.

• Context: This issue arises during system reboot tests and is associated with a custom carrier board combined with the Jetson Orin Nano 8GB module. The software version in use is JP5.1.2, and a specific HDMI driver configuration is applied.

• Frequency: The issue appears consistently during reboot tests but does not seem to impact overall device performance or functionality.

• Impact: While the error may cause concern regarding system reliability or performance, users have confirmed that it does not hinder normal operations, particularly HDMI output.

Possible Causes

Several potential causes for this issue have been identified:

• Hardware Incompatibilities: The custom carrier board may have design elements that lead to this assertion failure without affecting overall functionality.

• Software Bugs: There may be unresolved bugs in the JP5.1.2 software that trigger this log message without causing operational issues.

• Driver Issues: The HDMI driver specified might not align perfectly with the hardware configuration, leading to discrepancies reflected in the logs.

• Configuration Errors: Incorrect configurations in driver settings or system parameters could lead to this assertion failure being logged.

• Environmental Factors: Although not explicitly mentioned, factors such as power supply stability could potentially affect performance but are unlikely to be directly related to this log message.

Troubleshooting Steps, Solutions & Fixes

To address this issue, users can follow these troubleshooting steps:

1. Check HDMI Functionality:

   • Verify that HDMI output works correctly despite the error message.
   • If HDMI functions normally, this may confirm that the log entry does not indicate a critical failure.

2. Review System Logs:

   • Use the following command to check dmesg logs for additional context:

     dmesg | grep -i "minRequiredIsoBandwidthKBPS"
     

3. Ignore the Log Entry:

   • According to feedback from Nvidia’s driver team, users can safely ignore this log entry as it does not affect normal usage.
   • Document any instances of this log for future reference but proceed with normal operations.

4. Driver Updates:

   • Ensure that you are using the latest drivers compatible with your Jetson Orin Nano setup.
   • Check Nvidia’s official documentation for any updates or patches related to your software version (JP5.1.2).

5. Configuration Review:

   • Double-check your hardware configuration and ensure all settings align with Nvidia’s recommendations for custom carrier boards.
   • Adjust any parameters if discrepancies are found.

6. Community Engagement:

   • Engage with community forums or Nvidia support for additional insights or similar experiences from other users.
   • Share findings or solutions to help others who may encounter the same issue.

7. Documentation Reference:

   • Consult Nvidia’s official documentation for guidance on driver installation and hardware compatibility to prevent future issues.

Unresolved Aspects

While users have confirmed that normal operations are unaffected by this log entry, further investigation may be warranted if new symptoms arise or if additional errors appear in conjunction with this one. Users should remain vigilant and report any changes in behavior or new log entries that could provide further insight into potential underlying issues.