MC7455 sporadically wrong primary port

[Carlo Lobrano]

Hi Karoly,

which modem are you using?

cdc-wdmX and tty ports are used for totally different communication
protocols. Like, if you're modem supports QMI or MBIM, it's ok to use
cdc-wdmX, otherwise is ok to use tty. Also consider that is up to the
kernel to assign the number at the end of cdc-wdmX and that number depends
on which other hardware is connected to USBs.
i.e. when I have my usb earphones connected, the kernel assigns cdc-wdm1 to
the modem instead of cdc-wdm0.

Carlo

On 4 July 2017 at 15:36, Karoly Pados <kp at tec4data.at> wrote:

> Hello,
>
> Sometimes MM picks the wrong primary port. What I observed is that
> everything works if it picks cdc-wdm0. But pretty often it picks cdc-wdm1,
> in which case NetworkManager is unable to establish a data connection.
> Sometimes, much more rarely, it even picks ttyUSB0, and NM is then also
> unable to do anything useful with the modem.
>
> Now I'm not 100% sure that this is the cause for our problems, so my first
> question: Is it plausible at all that anything other than cdc-wdm0 as a
> primary port is a problem?
>
> If so:
> - What can I provide to help solve this in code?
> - Is there a way around it? (for example, a way to force MM to pick a
> specific port as primary?)
>
> Thank you,
> Karoly
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>
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