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Millumin 5 with Enttecc USB DMX PRO

Ricky_TSRicky_TS
in MAIN

I’m experiencing an intermittent disconnection issue with the ENTTEC DMX USB Pro while running Millumin 5.12.p on an M1 Mac.


Environment:

- macOS [your version here] (M1)

- Millumin 5.12.p

- ENTTEC DMX USB Pro (with latest FTDI VCP driver installed from FTDI website)

- Direct USB connection (no hub)

- FTDI driver was updated recently from 2.4.2 to the latest version


Issue description:

During show operation, the DMX USB Pro stops receiving/sending data in Millumin, even though:

- macOS USB logs show no physical disconnection or port reset events during the incident

- The device remains powered, and “System Information” shows it as connected

- This suggests a possible **logical disconnection** (session closed or driver reset) rather than a physical USB link drop


Additional notes:

- The device has been stable for hours in other sessions

- The problem occurs suddenly during operation

- No other USB devices are connected to the same controller

- Reconnecting the device or restarting Millumin restores functionality


Could you advise if there are any known issues in Millumin 5.x that could cause the DMX USB Pro serial session to close unexpectedly on macOS M1?

Would you recommend any specific debugging options or logs to capture when this happens again?


Thank you for your support.

Best regards,  

Comments

  • MilluminMillumin

    Hello @Ricky_TS,

    We are not aware of such an issue.

    A few questions to better understand the situation :

    • Could you reproduce the problem ? If so, how exactly ?
    • Are you sure your USB DMX is correctly plugged and cannot be disconnected by mistake ?
    • Do you have another USB DMX : if so, could you check if you have the problem ?
    • Could you check with Millumin V4 : do you have the same problem ?

    Thank you for your answers.

    Best. Philippe

  • Ricky_TSRicky_TS

    Hello Philippe,


    • The issue is not reproducible on demand, but it has reoccurred several times. The reproducibility rate is low.
    • The USB DMX connection is stable and securely plugged, so accidental disconnection is unlikely.
    • I do not have another USB DMX unit available to test.
    • I have not tested with Millumin V4 on the same computer.
    • I have now switched to a non–Apple Silicon Mac mini, which has previously run this exact setup for over two weeks without any issues.


    I will continue monitoring the situation and will update you if I find more specific reproduction steps.


    Best regards, Ricky.

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