Huawei E5776

[Dan Williams]

On Tue, 2014-04-15 at 13:52 +0100, George Hills wrote:
> Hi Thomas,
> 
> Many thanks for getting backto me so quickly.
> 
> On 15/04/14 12:53, Thomas Schäfer wrote:
> > I think, this is the way it should be done. The ModemManager should
> > ignore this device completely and the NetworkManager should configure
> > it like an LAN-device.
> 
> That makes good sense to me.
> 
> NetworkManager doesn't seem to want to manage this device.Do you think I
> should ask the NetworkManager people?

Sure, but we can talk about it here too :)  Many of the NM/MM developers
are subscribed to both lists.

If ModemManager claims the device, NetworkManager will ignore the
ethernet interface until the modem is connected with ModemManager.  If
the device doesn't actually require AT or other commands to start the
connection, then ModemManager should probably just ignore it.

The second problem is that the device is tagged WWAN in the huawei
cdc_ncm kernel driver but doesn't acutally require AT/MBIM/etc commands
for the data connection to work.  NetworkManager treats and WWAN-tagged
device as requiring ModemManager handling (because that's what the WWAN
tag means) and won't treat it as a normal ethernet interface.

So the basic issue is that somehow, huawei_cdc_ncm needs to distinguish
between these devices, and only tag devices that require AT/MBIM/QMI/etc
control as WWAN.  Then NM will treat it as a normal ethernet interface.

Dan

> I am running Debian's package of it: 0.9.8.8-5
> 
> > I can't remember trouble with usb_modeswitch. I will investigate the
> > behavior again later.
> 
> Let me know if you want more information. I am happy to help/experiment.
> 
> > Only one hint: There was a bug in kernel 3.13 regarding this device,
> > it is already fixed. 3.13 stable and 3.14 are fine again.
> >
> I'm running 3.14; 3.14-trunk-amd64 #1 SMP Debian 3.14-1~exp1 (2014-04-09)
> 
> Cheers
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