Re: 3G Modem DHCP time out

[Bjørn Mork <bjorn mork no>]

Emmanuel Riboulet-Deyris <erd lastree net> writes:

> Thank's a lot Bjørn for pointing me this bug report. It appears that
> it's exactly the bug I'm encountering (on the same laptop by the way).
>
> I'm very far away from being an expert about that, but if I understand,
> the simplest way to make thinks work currently with a 3.8.x kernel would
> be to rebuild my kernel with the key CONFIG_USB_NET_CDC_MBIM set to "n".
> Is that correct ?

Sorry for the delayed answer.  Too much vacation outside civilization :)

I believe the best option is upgrading to 3.8.5 or newer and setting the
new cdc_ncm parameter "prefer_mbim" to false. E.g. by adding a
/etc/modprobe.d/foo.conf with

  options cdc_ncm prefer_mbim=N

This will make cdc_ncm/cdc_mbim prefer NCM over MBIM without sacrificing
the MBIM support completely.


Bjørn