Hello,

I'm having trouble getting a 3g usb dongle to work on Centos7.
This is a standard, new Centos7 install.

The machine detects the device:
[root@jvermeulen jvermeulen]# dmesg | tail -n15
[ 502.189442] usb 2-2: new high-speed USB device number 8 using ehci-pci
[ 502.304508] usb 2-2: New USB device found, idVendor=12d1, idProduct=14fb
[ 502.304520] usb 2-2: New USB device strings: Mfr=2, Product=1, SerialNumber=0
[ 502.304528] usb 2-2: Product: HUAWEI Mobile
[ 502.304535] usb 2-2: Manufacturer: HUAWEI Technology

On Centos6 it gets mounted on Media and I can install the software.
On Fedora21 the device gets switched by usb_modeswitch and works out of the box.

On Centos7 the usb gets mounted on /run/media/user but I cannot install it.
Whatever I try, I get the message " the software must be installed as root".

So I installed ModemManager,usb_modeswitch and usb-modeswitch-data and added this line to /lib/udev/rules.d/40-usb_modeswitch.rules:

# vodafone from hell
ATTR{idVendor}=="12d1", ATTR{idProduct}=="1f1c", RUN+="/usr/sbin/usb_modeswitch -d -v 12d1 -p 1f1c -u 2"

Now the device gets switched, but I see this EM:

May 15 21:01:06 jvermeulen kernel: usb usb2-port2: disabled by hub (EMI?), re-enabling...
May 15 21:01:06 jvermeulen kernel: usb 2-2: USB disconnect, device number 9
May 15 21:01:06 jvermeulen kernel: usb 2-2: bind() failure
May 15 21:01:06 jvermeulen systemd-udevd: '/usr/sbin/usb_modeswitch -d -v 12d1 -p 1f1c -u 2' [3643] terminated by signal 6 (Aborted)

then this message:

May 15 21:01:49 jvermeulen kernel: option 2-2:1.0: GSM modem (1-port) converter detected
May 15 21:01:49 jvermeulen kernel: usb 2-2: GSM modem (1-port) converter now attached to ttyUSB0
May 15 21:01:49 jvermeulen kernel: option 2-2:1.1: GSM modem (1-port) converter detected
May 15 21:01:49 jvermeulen kernel: usb 2-2: GSM modem (1-port) converter now attached to ttyUSB1
May 15 21:01:49 jvermeulen mtp-probe: checking bus 2, device 15: "/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-2"
May 15 21:01:49 jvermeulen mtp-probe: bus: 2, device: 15 was not an MTP device
May 15 21:01:49 jvermeulen ModemManager[1044]: <warn> (ttyUSB0): port attributes not fully set
May 15 21:02:19 jvermeulen ModemManager[1044]: <info> Creating modem with plugin 'Huawei' and '2' ports
May 15 21:02:19 jvermeulen ModemManager[1044]: <warn> Could not grab port (tty/ttyUSB1): 'Cannot add port 'tty/ttyUSB1', unhandled serial type'
May 15 21:02:19 jvermeulen ModemManager[1044]: <warn> Could not grab port (tty/ttyUSB0): 'Cannot add port 'tty/ttyUSB0', unhandled serial type'
May 15 21:02:19 jvermeulen ModemManager[1044]: <warn> Couldn't create modem for device at '/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-2': Failed to find primary AT port

I have no clue on what to try next.
Any advise would be greatly appreciated.

greetings, Johan

uninstall modemmanager, try wvdial.
wvdial has saved many frustrated dongle users.

Hello Ondoho,

thanks very much for the reply.
I didn't get around to configuring wvdial today.
Instead I disabled usb_modeswitch again and had another crack at installing the software
on the usb stick.
And that finaly worked.
Since I always got the message " you must install as root user, I commented out this part of the install script:

#if [ `id | awk '{print $1}'` != "uid=0(root)" ]
#then
# echo "You must run the install process by root." | tee -a ${LOG_PATH}
# install_exit
#fi

and I installed these packages:
libstdc++.so.6
libusb-0.1.so.4

That's it. It now works immediately after plug in.

Greetings, Johan

nice to hear.
so the stick has linux software on it.
i didn't quite catch that before.

anyhow, could you mark this solved now? under "Thread tools" iirc.

Hello,

as mentioned above:

On Centos6 it gets mounted on Media and I can install the software.
On Fedora21 the device gets switched by usb_modeswitch and works out of the box.

On Centos7 I expected it to behave like on Fedora21, with the help of usb_modeswitch.
But as often, the answer was hidden in a script.

Greetings, Johan