See the following scenario:
1) turn on the computer, log in
2) connect the USB modem Huawei E173
3) The modem is not detected (see the following commands):
% lsusb|grep -i huawei
Bus 001 Device 005: ID 12d1:1c0b Huawei Technologies Co., Ltd. E173s 3G broadband stick (modem off)
% ls /dev/ttyUSB*
no matches found: /dev/ttyUSB*
To activate modem run:
4) remove the USB modem Huawei E173
5) Run the following command to load usbserial module (see correct vendor and product code):
# modprobe -v usbserial vendor=0x12d1 product=0x1c08
6) You can also turn on usb_modeswitch logging:
# diff /etc/usb_modeswitch.conf-ORG /etc/usb_modeswitch.conf
19c19
< EnableLogging=0
---
> EnableLogging=1
7) connect the USB modem Huawei E173 again
The modem is properly detected:
# lsusb|grep Huawei
Bus 001 Device 007: ID 12d1:1c08 Huawei Technologies Co., Ltd.
# ls /dev/ttyUSB*
/dev/ttyUSB0 /dev/ttyUSB1
# tail -n 20 /var/log/usb_modeswitch.log
Mode switch succeeded. Bye.
ok:12d1:1c08
--------------------------------
(end of usb_modeswitch output)
Checking success of mode switch for max. 20 seconds ...
Reading attributes ...
USB dir exists: /sys/bus/usb/devices/1-1.2
Warning: USB attribute "serial" not readable.
All attributes matched
Mode switching was successful, found 12d1:1c08 (HUAWEI: HUAWEI Mobile)
Now checking for bound driver ...
driver has bound, device is known
Checking for AVOID_RESET_QUIRK kernel attribute
AVOID_RESET_QUIRK activated
All done, exiting
9) Now you can correctly connect using e.g. wvdial via /dev/ttyUSB0.
10) However NetworkManager detects the wrong device /dev/ttyUSB1
# nmcli dev|grep ttyUSB
ttyUSB1 gsm rozłączono
and it is not possible to connect the internet using the graphical network manager in KDE (Kubuntu 13.10), but with wvdial and /dev/ttyUSB0 it works fine.
Regards,
Pawel.
PS. Sometimes running the following command works fine, but not always (I don't know why).
# usb_modeswitch --default-vendor 0x12d1 --default-product 1c0b --target-vendor 0x12d1 --target-product 0x1c08
However when it finally activates modem properly, the network manager finds the correct device /dev/ttyUSB0.