Dell NativeEdge: Extra Dummy tty Interfaces Displayed When 5G Modem Manager Is Corrupted

Summary: When a 5G modem manager session becomes stale or corrupted on an Edge device, the NativeEdge UI may incorrectly display extra dummy tty* interfaces under Hardware → Network Adapters. In this state, cellular connectivity cannot be enabled, and SIM detection may fail. This is a known behavior, not a software defect. The issue can be fully resolved through a hard power‑cycle reset of the device, which forces correct modem and Modem Manager reinitialization. ...

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Symptoms

Users may observe the following after onboarding a gateway to Edge Orchestrator (EO):

  • Two or more cellular devices shown under Network Adapters
  • Presence of dummy tty* interfaces
  • Cellular option cannot be enabled
  • SIM card not detected
  • No functional cellular connectivity

Cause

  • The Modem Manager service on the device enters a stale or corrupted state
  • Modem ports are incorrectly enumerated
  • This results in:
    • Dummy tty* interfaces being exposed to the UI
    • Failure in SIM detection
  • The issue persists across reboots unless a full modem reset is performed

Resolution

Performing a hard power-cycle reset forces a complete modem reset and clean reinitialization of the Modem Manager session. After the power cycle:

  • Modem ports are enumerated correctly
  • Dummy modem interfaces are no longer present
  • SIM detection functions as expected

Once the modem is reinitialized, the issue is no longer reproducible.

Recommendation

If this issue is observed in the field, a hard power-cycle reset is recommended as the first remediation step. If the problem persists after a power cycle, further investigation into modem firmware or device stability may be required.

Affected Products

NativeEdge Solutions
Article Properties
Article Number: 000451043
Article Type: Solution
Last Modified: 06 ذو القعدة 1447
Version:  1
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