Re: GSM dongle fails to connect

[Aleksander Morgado <aleksander lanedo com>]

>> Which modem is this? If it's a Huawei modem, your issue may be known
>> (wrong tty used for data).
> 
> It is Huawei (initial vid/pid 12d1:1c0b, then switched to 12d1:1c08 by
> usb_modeswitch). But the thing is that the driver exposes 2 ttys, and
> both of them respond. I successfully connected with screen directly and
> sent some AT commands and got back the response.
> 
> I know that ModemManager tries to do auto detection - because usually
> only one tty should respond and probably ModemManager relies on this for
> detecting the "valid" tty. Given the fact that both ttys respond, I have
> no idea how one of them is picked as "good".
> 

There are different ways of detecting which port is to be used for
control and which for data. In some huawei modems we base the logic on
the GETPORTMODE result.


>> I would try to grab both ModemManager and NetworkManager debug logs. See
>> the "Debugging NetworkManager 0.8 and 0.9 3G connections" section at
>> https://live.gnome.org/NetworkManager/Debugging.
> 
> Thanks! I had done that already, but I'm not sure about the mailing list
> policy. Is it ok to post back on the list and include it as an
> attachment? It's around 60k (or 7k if I gzip it).
> 

Just reply with the ModemManager debug log attached, that's ok.

-- 
Aleksander