I am using Linux Mint since a few years now; yet I hardly ever reach out for help. Most of the things I can work-around on my own, but this one seems like too much...
I am using Dell Latitude 7480 with Linux Mint 18.3 and with the newest kernel available, 4.13.0-37. I have bought a WWAN modem recently, namely Sierra EM7455. The problem is that it cannot connect to the network. However, I could do that on Windows 10.
I have googled a lot on this problem and I saw that there was a lot of trouble, somewhere around a year ago, with even detecting the device correctly. I think these issues do not apply to me, as the modem is detected.
I have figured these outputs might be useful to debug my issue:
Code: Select all
bartlomiej@Latitude-7480 ~ $ sudo apt-get install libqmi-utils
Reading package lists...
Building dependency tree...
Reading state information...
libqmi-utils is already the newest version (1.16.2-1ubuntu0.16.04.1).
0 to upgrade, 0 to newly install, 0 to remove and 0 not to upgrade.
bartlomiej@Latitude-7480 ~ $ sudo apt-get install libmbim-utils
Reading package lists...
Building dependency tree...
Reading state information...
libmbim-utils is already the newest version (1.14.0-1ubuntu0.16.04.1).
0 to upgrade, 0 to newly install, 0 to remove and 0 not to upgrade.
bartlomiej@Latitude-7480 ~ $ sudo apt-get install modemmanager
Reading package lists... Done
Building dependency tree
Reading state information... Done
modemmanager is already the newest version (1.6.4-1ubuntu0.16.04.1).
0 to upgrade, 0 to newly install, 0 to remove and 0 not to upgrade.
bartlomiej@Latitude-7480 ~ $ mmcli -L
Found 1 modems:
/org/freedesktop/ModemManager1/Modem/0 [Dell] MBIM [413C:81B6]
bartlomiej@Latitude-7480 ~ $ mmcli -m 0
/org/freedesktop/ModemManager1/Modem/0 (device id '55eead2494c3db24ea3c40f40fb5a1a08fc41f0e')
-------------------------
Hardware | manufacturer: 'Dell'
| model: 'MBIM [413C:81B6]'
| revision: 'MPSS.BO.2.5-00112-M9635TAAAANA'
| supported: 'gsm-umts, lte'
| current: 'gsm-umts, lte'
| equipment id: '359073060006545'
-------------------------
System | device: '/sys/devices/pci0000:00/0000:00:14.0/usb2/2-2'
| drivers: 'qcserial, cdc_mbim'
| plugin: 'Dell'
| primary port: 'cdc-wdm1'
| ports: 'ttyUSB2 (at), cdc-wdm1 (mbim), wwp0s20f0u2i12 (net)'
-------------------------
Numbers | own : 'unknown'
-------------------------
Status | lock: 'none'
| unlock retries: 'sim-pin2 (3)'
| state: 'registered'
| power state: 'on'
| access tech: 'umts'
| signal quality: '35' (cached)
-------------------------
Modes | supported: 'allowed: 3g, 4g; preferred: none'
| current: 'allowed: 3g, 4g; preferred: none'
-------------------------
Bands | supported: 'unknown'
| current: 'unknown'
-------------------------
IP | supported: 'ipv4, ipv6, ipv4v6'
-------------------------
3GPP | imei: 'xxxxxxxxxxxxxxx'
| enabled locks: 'fixed-dialing'
| operator id: '26001'
| operator name: 'Aero2'
| subscription: 'unknown'
| registration: 'home'
-------------------------
SIM | path: '/org/freedesktop/ModemManager1/SIM/0'
-------------------------
Bearers | paths: '/org/freedesktop/ModemManager1/Bearer/2'
bartlomiej@Latitude-7480 ~ $ lsmod | grep wwan
usb_wwan 20480 1 qcserial
usbserial 45056 4 qcserial,usb_wwan
bartlomiej@Latitude-7480 ~ $ dmesg | grep mbim
[ 5.813418] cdc_mbim 2-2:1.12: cdc-wdm1: USB WDM device
[ 5.813541] cdc_mbim 2-2:1.12 wwan0: register 'cdc_mbim' at usb-0000:00:14.0-2, CDC MBIM, 6e:52:83:a5:4b:b1
[ 5.813949] usbcore: registered new interface driver cdc_mbim
[ 6.014271] cdc_mbim 2-2:1.12 wwp0s20f0u2i12: renamed from wwan0