E3372 4G usb modem not detected

For Developers
1

Just built latest OpenWrt master (a0d5acfbe2bd4f9423d08d88706456e0bd62d4ce) with usb-modswitch and kmod-usb-net-cdc-ether. E3372 4G Modem interface eth1 doesn't show up.

Output of dmesg when connection the modem :

[   29.819307] br-lan: port 2(wlan0) entered disabled state
[   29.825143] device wlan0 entered promiscuous mode
[   30.997920] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[   31.004670] br-lan: port 2(wlan0) entered blocking state
[   31.010130] br-lan: port 2(wlan0) entered forwarding state
[   50.180719] random: crng init done
[   50.184207] random: 6 urandom warning(s) missed due to ratelimiting
[   52.670856] usb 1-1.2: new high-speed USB device number 4 using ehci-platform
[   53.329471] usb 1-1.2: USB disconnect, device number 4
[   53.876908] usb 1-1.2: new high-speed USB device number 5 using ehci-platform

Output of ifconfig

br-lan    Link encap:Ethernet  HWaddr XX:XX:XX:XX:XX:XX
          inet addr:192.168.2.1  Bcast:192.168.2.255  Mask:255.255.255.0
          inet6 addr: fe80::ec8c:8aff:fe29:8cd3/64 Scope:Link
          inet6 addr: fd74:5249:55a5::1/60 Scope:Global
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1324 errors:0 dropped:0 overruns:0 frame:0
          TX packets:867 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:123685 (120.7 KiB)  TX bytes:169050 (165.0 KiB)

eth0      Link encap:Ethernet  HWaddr XX:XX:XX:XX:XX:XX
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:388 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:50299 (49.1 KiB)
          Interrupt:5

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:404 errors:0 dropped:0 overruns:0 frame:0
          TX packets:404 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:49300 (48.1 KiB)  TX bytes:49300 (48.1 KiB)

wlan0     Link encap:Ethernet  HWaddr XX:XX:XX:XX:XX:XX
          inet6 addr: fe80::21c:c2ff:fe30:8970/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1320 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1166 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:142141 (138.8 KiB)  TX bytes:230796 (225.3 KiB)
2

Does any of the topics help that you can find when you search the forum for E3372?

3

I installed the same packages on OpenWrt 18.06.1 (stable) and it worked. But using those same packages on the latest build from master breaks support for the 4G modem which indicates a regression.