RE: Novatel based Mobile Broadband does not respond anymore

[Dan Williams <dcbw redhat com>]

On Fri, 2012-02-03 at 11:42 +0100, richter ecos de wrote:
> Hi Dan,
> 
> thanks for your feedback. 
> 
> I will setup a build environment for modem manger and give it a try (it will take some time until I get the time to do so).
> 
> In case this solves the problem, I would suggest to add a udev variable to configure the charset order depending on the modem type ( I don't think it's necessary to create an extra plugin for this special case).
> 
> Would this make sense to you?

I was thinking more of a Novatel-specific override in the Novatel
plugin... there is one more bug too.  The novatel plugin should be
treating USB interface 0 as the modem/dial interface and the second port
as the auxiliary port, but if the device has already been switched to
two-port mode with AT$DMAT=1 then if ModemManager is restarted, it might
find the second port first and use that as primary.  And I don't think
my 5510 likes that very much either.

Dan

> Thanks & Regards
> 
> Gerald
> 
> 
> > -----Original Message-----
> > From: Dan Williams [mailto:dcbw redhat com]
> > Sent: Thursday, February 02, 2012 8:46 PM
> > To: Gerald Richter - ECOS
> > Cc: networkmanager-list gnome org
> > Subject: Re: Novatel based Mobile Broadband does not respond anymore
> > 
> > On Thu, 2012-01-26 at 16:13 +0100, richter ecos de wrote:
> > > Hi,
> > >
> > > we've problems with a Novatel based Mobile Broadband card.
> > >
> > > The serial device doesn't respond to AT Commands after it has been
> > > initialized and a successfully registration to an apn.
> > > The modem-manager falls back in an endless loop after that behavior.
> > >
> > > Bus 004 Device 002: ID 413c:8137 Dell Computer Corp. Wireless 5520
> > > Voda L Mobile Broadband (3G HSDPA) Minicard Status Port
> > >
> > > The logfile is attached.
> > >
> > > Before we used network manager, we had a very simply umts solution,
> > which only uses a few AT commands. This did work for quite a long time.
> > >
> > > It seems that the firmware crashes on some of the AT command (coldstart
> > is necessary, to get the card working again).
> > >
> > > Any ideas?
> > 
> > I've seen the firmware of my 5510 (which is basically the EU870D except in
> > ExpressCard form) crash when doing SMS-related stuff.  If you're able to
> > rebuild ModemManager, try this patch and see if that helps anything:
> > 
> > diff --git a/src/mm-generic-gsm.c b/src/mm-generic-gsm.c index
> > 3a1c62e..be63d97 100644
> > --- a/src/mm-generic-gsm.c
> > +++ b/src/mm-generic-gsm.c
> > @@ -1260,10 +1260,10 @@ enable_failed (MMModem *modem, GError
> > *error, MMCallbackInfo *info)  }
> > 
> >  static guint32 best_charsets[] = {
> > +    MM_MODEM_CHARSET_IRA,
> >      MM_MODEM_CHARSET_UTF8,
> >      MM_MODEM_CHARSET_UCS2,
> >      MM_MODEM_CHARSET_8859_1,
> > -    MM_MODEM_CHARSET_IRA,
> >      MM_MODEM_CHARSET_GSM,
> >      MM_MODEM_CHARSET_UNKNOWN
> >  };
> > 
> > Some modems don't deal well with UCS2 and my 5510 is one of them.  The
> > charset doesn't just affect SMS so it might be causing the crashes.
> > 
> > Dan
> 
>