Info about Karmic modem manager and mode switching?

Antti Turunen antti.turunen at
Mon Dec 14 06:16:45 UTC 2009

Thanks Joao,

this is a good start.

I have already made an own udev rule file for selected modems requiring 
eject or usb_modeswitch and with it I already get the modems nicely to 
modem mode. Even though, that is not enough because network manager: a) 
does not recognize these modems at all or b) sees the modem but 
connecting to the net miserably fails.

In addition, if the modem-modeswitch could do the same as usb_modeswitch 
I would like to learn to use that instead, as it is readily there in 
Ubuntu. Seems that there is only one type "option-zerocd" available. Is 
it possible to add different types (like in usb_modeswitch) here?


On 12/13/2009 11:29 PM, Joao Pinto wrote:
> Hello Antti,
> I had the same problem, on my case NetworkManager was selecting a 
> random device from the 4 devices recognized from my Vodafone 3G PCMCIA 
> Card.
> I was directed to the following wiki page:
> Fortunately on my case the problem is already fixed on the daily 
> trunk, anyway I would like to understand how it works to isolate the 
> fix and backport to the stable version.
> I was investigation my problem based on HAL information (lshal, 
> 10-modem.fdi) from looking into similar bug reports, after looking at 
> the modemmanager source I have found I was looking at the wrong place 
> since udev is now used replacing HAL.
> From mm-manager.c I have found that mm scans/handles devices  with 
> subsystem "tty" and "net" .
> You can get a list of the currently detected udev devices with:
> udevadm info --export-db
> Now. I  need to find where is the modem date retrieved from I guess 
> there is an equivalent to hal-info with the modem information.
> Hope it helps.
> On Sun, Dec 13, 2009 at 7:18 PM, Antti Turunen 
> <antti.turunen at <mailto:antti.turunen at>> wrote:
>     Hello all,
>     we know there is many 3G modems not yet properly recognized and/or
>     connected by modem/network managers in 9.10.
>     I have been searching around for information how the whole new
>     modem-manager thing goes, but I have not been able to find much.
>     Could someone tell if there is info somewhere about modem-manager
>     plugins, different modem-modeswitch options etc? I am not a SW
>     developer, but would like to try some tailoring for certain
>     problematic modem models.
>     Thanks in advance,
>     Anttu
>     --
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> João Luís Marques Pinto
> GetDeb Team Leader
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