MC7455 not working

[Steven Pease]

Hi,
I'm trying to get the MC7455 working with kernel 4.4.5 or 4.4.6. My
workstation is running Arch which is using kernel 4.4.5 and
ModemManager 1.4.12. In the following, the modem is the only modem on
the system at index 1 since this is the second try following a reboot.

I'm trying to get an internet connect (IPV4) going over the modem. The
IMEI and Phone # appear to be correct although I've X'd them out.

$ mmcli -m 1
/org/freedesktop/ModemManager1/Modem/1 (device id
'3abb9e13c07a07a53a0e4f5881b52cd195f21502')
  -------------------------
  Hardware |   manufacturer: 'Sierra Wireless, Incorporated'
           |          model: 'MC7455'
           |       revision: 'SWI9X30C_02.04.07.00 r4823
CARMD-EV-FRMWR2 2015/11/04 06:51:37'
           |      supported: 'gsm-umts, lte'
           |        current: 'gsm-umts, lte'
           |   equipment id: 'XXXXXXXXXXXXXXX'
  -------------------------
  System   |         device: '/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-5'
           |        drivers: 'qmi_wwan, qcserial'
           |         plugin: 'Gobi'
           |   primary port: 'ttyUSB2'
           |          ports: 'ttyUSB0 (qcdm), ttyUSB2 (at),
wwp0s29f7u5i10 (net), wwp0s29f7u5i8 (net)'
  -------------------------
  Numbers  |           own : 'XXXXXXXXXXX'
  -------------------------
  Status   |           lock: 'none'
           | unlock retries: 'unknown'
           |          state: 'disabled'
           |    power state: 'on'
           |    access tech: 'unknown'
           | signal quality: '0' (cached)
  -------------------------
  Modes    |      supported: 'allowed: 2g, 3g, 4g; preferred: none'
           |        current: 'allowed: 2g, 3g, 4g; preferred: none'
  -------------------------
  Bands    |      supported: 'unknown'
           |        current: 'unknown'
  -------------------------
  IP       |      supported: 'ipv4, ipv6, ipv4v6'
  -------------------------
  3GPP     |           imei: 'XXXXXXXXXXXXXXX'
           |  enabled locks: 'none'
           |    operator id: 'unknown'
           |  operator name: 'unknown'
           |   subscription: 'unknown'
           |   registration: 'unknown'
  -------------------------
  SIM      |           path: '/org/freedesktop/ModemManager1/SIM/1'

  -------------------------
  Bearers  |          paths: 'none'

$ mmcli -m 1 --simple-connect="apn=broadband,ip-type=ipv4v6" --verbose
--timeout=1500
[21 Mar 2016, 22:31:19] [Debug] Forcing request to be run asynchronously
[21 Mar 2016, 22:31:19] [Debug] Assuming '1' is the modem index
[21 Mar 2016, 22:31:19] [Debug] ModemManager process found at ':1.31'
[21 Mar 2016, 22:31:19] [Debug] Modem found at
'/org/freedesktop/ModemManager1/Modem/1'

[21 Mar 2016, 22:31:19] [Debug] Asynchronously connecting the modem...
successfully connected the modem

$ mmcli -b 1
Bearer '/org/freedesktop/ModemManager1/Bearer/1'
  -------------------------
  Status             |   connected: 'yes'
                     |   suspended: 'no'
                     |   interface: 'ttyUSB2'
                     |  IP timeout: '20'
  -------------------------
  Properties         |         apn: 'broadband'
                     |     roaming: 'allowed'
                     |     IP type: 'ipv4v6'
                     |        user: 'none'
                     |    password: 'none'
                     |      number: 'none'
                     | Rm protocol: 'unknown'
  -------------------------
  IPv4 configuration |   method: 'ppp'
                     |  address: 'unknown'
                     |   prefix: '0'
                     |  gateway: 'unknown'
                     |      DNS: none
  -------------------------
  IPv6 configuration |   method: 'ppp'
                     |  address: 'unknown'
                     |   prefix: '0'
                     |  gateway: 'unknown'
                     |      DNS: none

Trying to get a lease from either wwan interface fails:

$ sudo dhcpcd wwp0s29f7u5i8
wwp0s29f7u5i8: waiting for carrier
wwp0s29f7u5i8: carrier acquired
wwp0s29f7u5i8: adding address fe80::aa33:9c69:b4fa:2796
DUID XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX
wwp0s29f7u5i8: IAID df:90:dc:bc
wwp0s29f7u5i8: soliciting a DHCP lease
wwp0s29f7u5i8: soliciting an IPv6 router
wwp0s29f7u5i8: no IPv6 Routers available
timed out
dhcpcd exited

$ sudo dhcpcd wwp0s29f7u5i10
wwp0s29f7u5i10: waiting for carrier
wwp0s29f7u5i10: carrier acquired
wwp0s29f7u5i10: adding address fe80::f614:fdf:279f:ae6c
DUID XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX
wwp0s29f7u5i10: IAID 67:d6:ab:9b
wwp0s29f7u5i10: soliciting a DHCP lease
wwp0s29f7u5i10: soliciting an IPv6 router
wwp0s29f7u5i10: no IPv6 Routers available
timed out
dhcpcd exited

I'm guessing I need to get MM to start the bearer on wwp0s29f7u5i10
instead of ttyUSB2, but so far I haven't figured out how to do this.

Thanks.

-- 
- Steven