Re: Nokia 3G USB Modem CS-17 very unreliable

[Dan Williams <dcbw redhat com>]

On Sun, 2011-11-13 at 00:35 +0200, Uwe Geuder wrote:
> Hi!
> 
> I have a Nokia 3G USB Modem CS-17. Unfortunately it works very
> unreliable under Linux. If used it with Ubuntu Lucid 10.04 LTS,
> OpenSUSE 11.3, OpenSUSE 11.4, and Windows XP.
> 
> Under Linux the failure rate is some 60%-80% and retrying repeatedly
> does not help. Under XP the failure rate is some 10% and if the first
> attempt fails retrying helps.

Based on our IRC debugging yesterday, I've gone ahead and pushed a fix
to ModemManager that uses only USB interface 0 for PPP on these devices
since that's what the Windows driver indicates.  The driver didn't have
a section for your variant of the CS-17 (0x0623) but I added that USB ID
anyway.

Dan

> If the connection succeeds it is typically very good. I have used it
> about 1 hour on a running train and I have reached connection speeds
> up to 5 Mbit/s (not on a running train though...)
> 
> The attached logs are from Lucid, which uses NetworkManager 0.8-0ubuntu3.2
> and modem-manager 0.3-0ubuntu2.2.
> 
> The typical error case is no responses from LCP (see attached logs). In some
> rarer occasions the LCP responses are invalid. 
> 
> Not sure how this is related to network manager. But Linux PPP seems to be
> stable (in the meaning of no changes) for a long time. And it should not be
> a network issue, with XP I don't experience the same problem.
> 
> Can you spot anything helpful from the attached logs?
> 
> Does it make any sense to investigate with nm 0.8? If necessary I can
> build the newest version. But I vaguely remember from some earlier
> postings on this list that it's not completely trivial with all the
> interdependencies of NetworkManager, modem-manager, D-Bus,
> configuration in /etc, knetworkmanager[1], and what else might needed
> to be taken into account. So a pointer to instructions would be
> welcome.
> 
> Regards,
> 
> Uwe
> 
> 
> [1] I typically use KDE. But I have at least tried it once on a GNOME
> system and the connection problems were the same ones. I cannot
> imagine that the applet is the culprit.
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