MC7455 sporadically wrong primary port

[Carlo Lobrano]

On 4 July 2017 at 17:37, Karoly Pados <kp at tec4data.at> wrote:

> As you can see the modem has multiple ports. The modem is the only USB
> device in the whole system (except for the on-board USB wifi adapter, which
> is non-removable). The phenomenon I'm seeing is that the "primary port"
> above is often something else than cdc-wdm0, sometimes even a ttyUSBX, and
> in these cases the modem is unusable for data. The only workaround I have
> is to keep resetting the modem until the correct primary port is picked.
>


​Ok, I don't know this model, but I suppose that it does support MBIM or
QMI (so the cdc-wdm port), but that somethings something goes wrong and it
switches to AT protocol (and this is why it uses ttyUSB0).
To have more information, you should run ModemManager in debug mode and
provide the logs​
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