Modem not connecting on Ubuntu 16.04 (whereas it did on Ubuntu 14.04)

[Ajay Garg]

Installed 14.04 along-side 16.04, and observed the issue there too.

The reason turned out that I had disable USB-3.0 support in BIOS.
When I turned it on, the modem started connecting in both 14.04 and 16.04.

However, in 14.04 the "wwan" interface appears fine (and after running
"dhclient" on it, the internet works fine).
However on 16.04, no "wwan" interface appears, even after *mmcli -m 11
--simple-connect="apn=airtelgprs.com <http://airtelgprs.com>" *has resulted
in successful-connection.


A maybe related symptom is that ethernet-interfaces appear as "eth0" and
"eth1" in 14.04, but as "enp1s0" and "enp2s0" in 16.04. But even then, NO
ADDITIONAL INTERFACE appears when *mmcli -m 11
--simple-connect="apn=airtelgprs.com <http://airtelgprs.com>" *has resulted
in successful-connection on 16.04.

Looks very weird; I will be thankful for any help.


Thanks and Regards,
Ajay



On Tue, Aug 30, 2016 at 9:52 AM, Ajay Garg <ajaygargnsit at gmail.com> wrote:

> Hi All.
>
> I followed the following steps ::
>
> a)
> Installed Ubuntu 16.04.
>
> b)
> sudo add-apt-repository -y ppa:aleksander-m/modemmanager-xenial
> sudo apt-get update
> sudo apt-get install -y modemmanager
> sudo reboot
>
>
> c)
> I am using a Sierra modem in QMI-mode.
>
> *lsusb*
> *Bus 001 Device 017: ID 1199:68a2 Sierra Wireless, Inc. *
> Bus 001 Device 005: ID 05e3:0608 Genesys Logic, Inc. Hub
> Bus 001 Device 004: ID 046d:c05a Logitech, Inc. M90/M100 Optical Mouse
> Bus 001 Device 003: ID 413c:2107 Dell Computer Corp.
> Bus 001 Device 002: ID 8087:07e6 Intel Corp.
> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
>
>
> d)
> *mmcli -L*
>
> Found 1 modems:
>     /org/freedesktop/ModemManager1/Modem/11 [QUALCOMM INCORPORATED] 0
>
> *mmcli -m 11 -e*
> successfully enabled the modem
>
> *mmcli -m 11 --set-allowed-modes='2G'*
> successfully set current modes in the modem
>
>
> *mmcli -m 11 --create-bearer="apn=airtelgprs.com <http://airtelgprs.com>"*Successfully
> created new bearer in modem:
>     /org/freedesktop/ModemManager1/Bearer/7
>
> *mmcli -m 11 --simple-connect="apn=airtelgprs.com <http://airtelgprs.com>"*
> error: couldn't connect the modem: 'Timeout was reached'
>
>
> I keep getting the timeout-error, irrespecitive of multiple
> machine-reboots and modem-resets.
>
> The strangest part is that the same process used to work on Ubuntu-14.04,
> so I guess something is screwing up on Ubuntu-16.
> I will be grateful to receive any help, kindly let know any
> diagnostic-information that would help in catching the root-cause.
>
>
> Thanks and Regards,
> Ajay
>



-- 
Regards,
Ajay
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