I am experiencing quite a strange behavior when trying to set up LTE
connection via network manager and mc7455 usb modem.
On first boot it just hangs:
> nmcli
cdc-wdm0: connecting (prepare) to lte
"cdc-wdm0"
modem (qmi_wwan), hw
Setting connection down and up does not help. Setting interface up/down
also has no effects. **The only thing that helps is `sudo reboot` after
which nm is able to connect.** Here is modem manager info:
> mmcli -m 0
-------------------------
Hardware | manufacturer: 'Sierra Wireless, Incorporated'
| model: 'MC7455'
| revision: 'SWI9X30C_02.24.05.06 r7040
CARMD-EV-FRMWR2 2017/05/19 06:23:09'
| supported: 'gsm-umts
| lte
| gsm-umts, lte'
| current: 'lte'
| equipment id: '359072065668879'
-------------------------
System | device: '/sys/devices/70090000.xusb/usb1/1-2/1-2.2'
| drivers: 'qmi_wwan'
| plugin: 'Sierra'
| primary port: 'cdc-wdm0'
| ports: 'cdc-wdm0 (qmi), wwan0 (net), wwan1 (net),
cdc-wdm1 (qmi)'
-------------------------
Numbers | own : '79215547030'
-------------------------
Status | lock: 'sim-pin2'
| unlock retries: 'sim-pin (3), sim-pin2 (3), sim-puk (10),
sim-puk2 (10)'
| state: 'enabled'
| power state: 'on'
| access tech: 'unknown'
| signal quality: '0' (cached)
-------------------------
Modes | supported: 'allowed: 4g; preferred: none'
| current: 'allowed: 4g; preferred: none'
-------------------------
Bands | supported: 'u2100, u1800, u1900, u17iv, u850, u900,
eutran-i, eutran-ii, eutran-iii, eutran-iv, eutran-v, eutran-vii,
eutran-viii, eutran-xii, eutran-xiii, eutran-xx, eutran-xxv, eutran-xli'
| current: 'u2100, u1800, u1900, u17iv, u850, u900,
eutran-i, eutran-ii, eutran-iii, eutran-iv, eutran-v, eutran-vii,
eutran-viii, eutran-xii, eutran-xiii, eutran-xx, eutran-xxv, eutran-xli'
-------------------------
IP | supported: 'ipv4, ipv6, ipv4v6'
-------------------------
3GPP | imei: '359072065668879'
| enabled locks: 'none'
| operator id: 'unknown'
| operator name: 'unknown'
| subscription: 'unknown'
| registration: 'unknown'
-------------------------
SIM | path: '/org/freedesktop/ModemManager1/SIM/0'
-------------------------
Bearers | paths: 'none'
Related systemctl logs:
Jun 29 14:33:09 localhost.localdomain NetworkManager[3380]: <info>
[1593441189.3910] modem["cdc-wdm0"]: modem state changed, 'disabled' -->
'enabling' (reason: user preference)
Jun 29 14:33:09 localhost.localdomain NetworkManager[3380]: <info>
[1593441189.3949] manager: (cdc-wdm0): new Broadband device
(/org/freedesktop/NetworkManager/Devices/4)
Jun 29 14:33:09 localhost.localdomain NetworkManager[3380]: <info>
[1593441189.3954] device (cdc-wdm0): state change: unmanaged ->
unavailable (reason 'managed', sys-iface-state: 'external')
Jun 29 14:33:09 localhost.localdomain NetworkManager[3380]: <info>
[1593441189.3958] device (cdc-wdm0): modem state 'enabling'
Jun 29 14:33:09 localhost.localdomain NetworkManager[3380]: <info>
[1593441189.3968] device (cdc-wdm0): state change: unavailable ->
disconnected (reason 'none', sys-iface-state: 'managed')
Jun 29 14:33:09 localhost.localdomain NetworkManager[3380]: <info>
[1593441189.3976] policy: auto-activating connection 'lte'
Jun 29 14:33:09 localhost.localdomain NetworkManager[3380]: <info>
[1593441189.4000] device (cdc-wdm0): Activation: starting connection 'lte'
(13d2ea02-ff40-4d56-848e-5d61f064db7b)
Jun 29 14:33:09 localhost.localdomain NetworkManager[3380]: <info>
[1593441189.4005] device (cdc-wdm0): state change: disconnected -> prepare
(reason 'none', sys-iface-state: 'managed')
Jun 29 14:33:09 localhost.localdomain NetworkManager[3380]: <info>
[1593441189.4011] manager: NetworkManager state is now CONNECTING
Jun 29 14:33:12 localhost.localdomain NetworkManager[3380]: <info>
[1593441192.1162] modem["cdc-wdm0"]: modem state changed, 'enabling' -->
'enabled' (reason: user-requested)
Jun 29 14:33:09 localhost.localdomain ModemManager[3383]: <info>
Simple connect state (4/8): Wait to get fully enabled
Jun 29 14:33:12 localhost.localdomain ModemManager[3383]: <info> Modem
/org/freedesktop/ModemManager1/Modem/0: state changed (enabling -> enabled)
Jun 29 14:33:12 localhost.localdomain ModemManager[3383]: <info>
Simple connect state (5/8): Register
Jun 29 14:34:12 localhost.localdomain ModemManager[3383]: <info>
Simple connect started...
Jun 29 14:34:12 localhost.localdomain ModemManager[3383]: <info>
Simple connect state (4/8): Wait to get fully enabled
Jun 29 14:34:12 localhost.localdomain ModemManager[3383]: <info>
Simple connect state (5/8): Register
Jun 29 14:35:15 localhost.localdomain ModemManager[3383]: <info>
Simple connect started...
Jun 29 14:35:15 localhost.localdomain ModemManager[3383]: <info>
Simple connect state (4/8): Wait to get fully enabled
Jun 29 14:35:15 localhost.localdomain ModemManager[3383]: <info>
Simple connect state (5/8): Register
My connection file:
sudo cat /etc/NetworkManager/system-connections/lte
[connection]
id=lte
uuid=13d2ea02-ff40-4d56-848e-5d61f064db7b
type=gsm
interface-name=cdc-wdm0
permissions=
[gsm]
apn=internet
[ipv4]
dns-search=
method=auto
[ipv6]
addr-gen-mode=stable-privacy
dns-search=
method=auto
Versions:
Ubuntu 18.04
> NetworkManager --version
1.10.6
> ModemManager --version
ModemManager 1.6.8
Hope for your help.
Thanks!
--
Sincerely yours, Kamnev Yuriy
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