modemmanager stuck at registration

Technical Support
1

0

I have a dual sim iot device which was running Modem manager 1.10 on ubuntu 16.04. Recently upgraded to Modem manager 1.20.0 on ubuntu 22.04.

When Switch from first slot to second slot, modem manager is stuck with 3GPP status “registered” with the warning messages

[modem0/bearer1] connection attempt #3 failed: Couldn’t find associated QMI port for ‘net/wwp0s29u1u1i10’

It is not the slot/SIM/APN issue because it gets data connection if the device is rebooted with the 2nd slot active.

Note: Sim Switch from 2nd slot to 1st slot works fine so can not be any issue with sim switch logic.

Any suggestion?

2

Hi, I’m the Toradex AI Assistant. I’m in early beta, and I would appreciate your feedback.
The Toradex Support team will follow up with you shortly!

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:+1: :-1:

Hi,

This is out of my scope, sorry.

Best regards,
Toradex AI Assistant

Please, also check if these links can help you solve your problem:

Resistive Touch Screen (Linux) | Toradex Developer Center.

3

Hey @madhurima,

Can you let us know which, module, carrier board and OS you are working with?

-Eric

4

Hi @madhurima ,
Can you give us some feedback on the points above?
Best regards,

5

Hi, I’m the Toradex AI Assistant. The Toradex Support team will follow up with you shortly!

Did you like my answer?

:+1: :-1:

Hello there!

It sounds like you’re encountering a challenging issue with ModemManager after your recent upgrade. Let’s see if we can work through this together.

The error message you mentioned suggests a problem with the QMI port configuration. Here are some steps you can take to troubleshoot and potentially resolve the issue:

  1. Verify QMI Port Configuration: The error indicates a problem with finding the associated QMI port. Use the mmcli command to list available modems and check their status:

    mmcli -L
mmcli -m 0

    These commands will help you verify if the modem is correctly detected and if the QMI ports are properly assigned.

  2. Check Modem and SIM Compatibility: Ensure that your modem and SIM cards are compatible with the new version of ModemManager. Sometimes, firmware updates or configuration changes are needed after a software upgrade.

  3. Review ModemManager Logs: Check the system logs for any additional error messages or warnings that might provide more context about the issue. You can use journalctl to view ModemManager logs:

    journalctl -u ModemManager

  4. Test with Different Configurations: Try switching the SIM slots and rebooting the device to see if the issue persists. This can help determine if the problem is specific to a particular slot or configuration.

  5. Update Modem Firmware: If possible, check for any available firmware updates for your modem. Firmware updates can sometimes resolve compatibility issues with newer software versions.

  6. Consult ModemManager Documentation: Review the ModemManager documentation for any changes or new configuration options introduced in version 1.20.0 that might affect your setup.

By following these steps, you should be able to diagnose the issue more effectively and identify a solution. If the problem persists, consider testing with a different modem or SIM card to rule out hardware-specific issues.

I hope this helps you get your device back on track!

Best regards,
Toradex AI Assistant

Please, also check if these links can help you solve your problem:

Modem Manager Error.