Questions[usb-modeswitch](ubuntu)

I have an issue with USB dongle detection. It works as expected if we plug in the dongle after boot. But it fails, if I reboot with the dongle connected. I verified the USB_ModeSwitch log(added below). It seems the USB_ModeSwitch reads the dongle path wrongly. Please help me in resolving this problem.

1. OS Version : Ubuntu 18.04.4 Server LTS (GNU/Linux 4.19.126.mptcp x86_64)

2. USB_ModeSwitch version : usb-modeswitch 2.5.2+repack0-2ubuntu1

3. Also see the USB_ModeSwitch log (/var/log/usb_modeswitch.log) below :

   USB_ModeSwitch log from Mon Sep 21 11:50:44 2020
   Use global config file: /etc/usb_modeswitch.conf
   Raw args from udev: 1-4.2.2-1-4.2.2:1.0:1.0
   Bus ID for device not given by udev.
   Trying to determine it from kernel name (1-4.2.2-1-4.2.2:1.0:1.0) ...
   Top device directory not found (/sys/bus/usb/devices/1-4.2.2-1-4.2.2)! Exit.
   

I've recently purchased a Wifi Dongle containing a Realtek rtl8811CU chipset. I'm using Ubuntu 18.04 LTS.

Luckily, after finding this Github repo, I could compile it and install the driver without any problem.

However, every time I connect the dongle, is detected as a Disk, and I need to run usb_modeswitch to make it work:

$ lsusb
 [...]
 Bus 001 Device 013: ID 0bda:1a2b Realtek Semiconductor Corp. 
$ sudo usb_modeswitch -KW -v 0bda -p 1a2b
$ lsusb
 [...]
 Bus 001 Device 014: ID 0bda:c811 Realtek Semiconductor Corp.

The device ID changes and now I can correctly use my Wifi dongle.

I've tried to add this entry, to the udev rules, located in /lib/udev/rules.d/40-usb_modeswitch.rules, supposedly to run the command every time the device is detected:

 # Realtek 8211CU Wifi AC USB
 ATTR{idVendor}=="0bda", ATTR{idProduct}=="1a2b", RUN+="usb_modeswitch '/%k'"

But then I recconect, and nothing happens.

I've checked that maybe you need a service to do this, but it seems that cannot be activated.

$ systemctl --all | grep usb_modeswitch
● [email protected]    loaded    failed   failed    USB_ModeSwitch_1-4.1                                                            
system-usb_modeswitch.slice       loaded    active   active    system-usb_modeswitch.slice    

$ systemctl status [email protected]
● [email protected] - USB_ModeSwitch_1-4.1
Loaded: loaded (/lib/systemd/system/[email protected]; static; vendor preset: enabled)
Active: failed (Result: exit-code) since Thu 2018-10-04 11:49:17 CDT; 2min 5s ago
    Docs: man:usb_modeswitch_dispatcher(1)
Process: 32216 ExecStart=/usr/sbin/usb_modeswitch_dispatcher --switch-mode 1-4.1 (code=exited, status=1/FAILURE)
Main PID: 32216 (code=exited, status=1/FAILURE)

oct 04 11:49:17  systemd[1]: Starting USB_ModeSwitch_1-4.1...
oct 04 11:49:17  usb_modeswitch_dispatcher[32216]: Could not read attribute: No such file or directory
oct 04 11:49:17  usb_modeswitch_dispatcher[32216]: Could not read attribute: No such file or directory
oct 04 11:49:17  systemd[1]: [email protected]: Main process exited, code=exited, status=1/FAILURE
oct 04 11:49:17  systemd[1]: [email protected]: Failed with result 'exit-code'.
oct 04 11:49:17  systemd[1]: Failed to start USB_ModeSwitch_1-4.1.

Seems that there is a problem with the Ubuntu wrapper, does anyone knows how I can investigate further? I'm new to systemd and udev rules, so I'm not really sure where to find more logs or debug features.

I just upgraded my netbook from Ubuntu 11.xx to 12.04 and after that I could not use my Alcatel X215 3G modem any more. With the former version of Ubuntu, I had installed the driver-tool package from Alcatel plus usb-modeswitch and wdial. All worked perfectly. After the upgrade no way. I could not find any trace of /dev/ttyUSB* in the file system.

How can I get my modem to work in 12.04?

I'm running ubuntu 10.04. I have a newly purchased TATA Photon+ Internet connection which supports Windows and Mac. On the Internet I found a article saying that it could be configured on Linux. I followed the steps to install it on Ubuntu from this link. I am still not able to get online, and need some help.

Also, it is very slow, but I was told that I would see speeds up to 3.1MB.

I dont have wvdial installed and cannot install it from apt as I'm not connected to internet

Booting from windows I dowloaded "wvdial" .deb package and tried to install on ubuntu but it's ended with dependency problem. Automatically, don't know how, I got connected to internet only for once. Immediately I installed wvdial package after this I followed the tutorials(I could not browse and upload the files here) . From then it's showing that the device is connected in the network connections but no internet connection. Once I disable the device, it won't show as connected again and I'll have to restart my system. Sometimes the device itself not detected(wondering if there is any command to re-read the all devices).

output of wvdialconf /etc/wvdial.cof:

#wvdialconf /etc/wvdial.conf

Editing `/etc/wvdial.conf'.

Scanning your serial ports for a modem.

ttyS0<*1>: ATQ0 V1 E1 -- failed with 2400 baud, next try: 9600 baud
ttyS0<*1>: ATQ0 V1 E1 -- failed with 9600 baud, next try: 115200 baud
ttyS0<*1>: ATQ0 V1 E1 -- and failed too at 115200, giving up.
Modem Port Scan<*1>: S1   S2   S3   
WvModem<*1>: Cannot get information for serial port.
ttyUSB0<*1>: ATQ0 V1 E1 -- failed with 2400 baud, next try: 9600 baud
ttyUSB0<*1>: ATQ0 V1 E1 -- failed with 9600 baud, next try: 9600 baud
ttyUSB0<*1>: ATQ0 V1 E1 -- and failed too at 115200, giving up.
WvModem<*1>: Cannot get information for serial port.
ttyUSB1<*1>: ATQ0 V1 E1 -- failed with 2400 baud, next try: 9600 baud
ttyUSB1<*1>: ATQ0 V1 E1 -- failed with 9600 baud, next try: 9600 baud
ttyUSB1<*1>: ATQ0 V1 E1 -- and failed too at 115200, giving up.
WvModem<*1>: Cannot get information for serial port.
ttyUSB2<*1>: ATQ0 V1 E1 -- OK
ttyUSB2<*1>: ATQ0 V1 E1 Z -- OK
ttyUSB2<*1>: ATQ0 V1 E1 S0=0 -- OK
ttyUSB2<*1>: ATQ0 V1 E1 S0=0 &C1 -- OK
ttyUSB2<*1>: ATQ0 V1 E1 S0=0 &C1 &D2 -- OK
ttyUSB2<*1>: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0 -- OK
ttyUSB2<*1>: Modem Identifier: ATI -- Manufacturer: +GMI: HUAWEI TECHNOLOGIES CO., LTD
ttyUSB2<*1>: Speed 9600: AT -- OK
ttyUSB2<*1>: Max speed is 9600; that should be safe.
ttyUSB2<*1>: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0 -- OK

Found a modem on /dev/ttyUSB2.
Modem configuration written to /etc/wvdial.conf.
ttyUSB2<Info>: Speed 9600; init "ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0"

output of wvdial:

#wvdial
--> WvDial: Internet dialer version 1.60
--> Cannot get information for serial port.
--> Initializing modem.
--> Sending: ATZ
ATZ
OK
--> Sending: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
OK
--> Sending: AT+CRM=1
AT+CRM=1
OK
--> Modem initialized.
--> Sending: ATDT#777
--> Waiting for carrier.
ATDT#777
CONNECT
--> Carrier detected.  Starting PPP immediately.
--> Starting pppd at Sat Oct 16 15:30:47 2010
--> Pid of pppd: 5681
--> Using interface ppp0
--> pppd: (u;[08]@s;[08]`{;[08]
--> pppd: (u;[08]@s;[08]`{;[08]
--> pppd: (u;[08]@s;[08]`{;[08]
--> pppd: (u;[08]@s;[08]`{;[08]
--> pppd: (u;[08]@s;[08]`{;[08]
--> pppd: (u;[08]@s;[08]`{;[08]
--> local  IP address 14.96.147.104
--> pppd: (u;[08]@s;[08]`{;[08]
--> remote IP address 172.29.161.223
--> pppd: (u;[08]@s;[08]`{;[08]
--> primary   DNS address 121.40.152.90
--> pppd: (u;[08]@s;[08]`{;[08]
--> secondary DNS address 121.40.152.100  
--> pppd: (u;[08]@s;[08]`{;[08]

Output of log message /var/log/messages:

Oct 16 15:29:44 avyakta-desktop pppd[5119]: secondary DNS address 121.242.190.180
Oct 16 15:29:58 desktop pppd[5119]: Terminating on signal 15
Oct 16 15:29:58 desktop pppd[5119]: Connect time 0.3 minutes.
Oct 16 15:29:58 desktop pppd[5119]: Sent 0 bytes, received 177 bytes.
Oct 16 15:29:58 desktop pppd[5119]: Connection terminated.
Oct 16 15:30:47 desktop pppd[5681]: pppd 2.4.5 started by root, uid 0
Oct 16 15:30:47 desktop pppd[5681]: Using interface ppp0
Oct 16 15:30:47 desktop pppd[5681]: Connect: ppp0 <--> /dev/ttyUSB2
Oct 16 15:30:47 desktop pppd[5681]: CHAP authentication succeeded
Oct 16 15:30:47 desktop pppd[5681]: CHAP authentication succeeded
Oct 16 15:30:48 desktop pppd[5681]: local  IP address 14.96.147.104
Oct 16 15:30:48 desktop pppd[5681]: remote IP address 172.29.161.223
Oct 16 15:30:48 desktop pppd[5681]: primary   DNS address 121.40.152.90
Oct 16 15:30:48 desktop pppd[5681]: secondary DNS address 121.40.152.100

EDIT 1 :

I tried the following

sudo stop network-manager
sudo killall modem-manager

sudo /usr/sbin/modem-manager --debug > ~/mm.log 2>&1 &

sudo /usr/sbin/NetworkManager --no-daemon > ~/nm.log 2>&1 &

Output of mm.log:

#vim ~/mm.log:

** Message: Loaded plugin Option High-Speed

** Message: Loaded plugin Option

** Message: Loaded plugin Huawei

** Message: Loaded plugin Longcheer

** Message: Loaded plugin AnyData

** Message: Loaded plugin ZTE

** Message: Loaded plugin Ericsson MBM

** Message: Loaded plugin Sierra

** Message: Loaded plugin Generic

** Message: Loaded plugin Gobi

** Message: Loaded plugin Novatel

** Message: Loaded plugin Nokia

** Message: Loaded plugin MotoC

Output of nm.log:

#vim ~/nm.log:

NetworkManager: <info>  starting...

NetworkManager: <info>  modem-manager is now available

NetworkManager:    SCPlugin-Ifupdown: init!

NetworkManager:    SCPlugin-Ifupdown: update_system_hostname

NetworkManager:    SCPluginIfupdown: guessed connection type (eth0) = 802-3-ethernet

NetworkManager:    SCPlugin-Ifupdown: update_connection_setting_from_if_block:     

name:eth0, type:802-3-ethernet, id:Ifupdown (eth0), uuid: 681b428f-beaf-8932-dce4-678ed5bae28e

NetworkManager:    SCPlugin-Ifupdown: addresses count: 1

NetworkManager:    SCPlugin-Ifupdown: No dns-nameserver configured in /etc/network/interfaces

NetworkManager: nm-ifupdown-connection.c.119 - invalid connection read from /etc/network/interfaces: (1) addresses

NetworkManager:    SCPluginIfupdown: management mode: unmanaged

NetworkManager:    SCPlugin-Ifupdown: devices added (path: /sys/devices/pci0000:00/0000:00:14.4/0000:02:02.0/net/eth1, iface: eth1)

NetworkManager:    SCPlugin-Ifupdown: device added (path: /sys/devices/pci0000:00/0000:00:14.4/0000:02:02.0/net/eth1, iface: eth1): no ifupdown configuration found.

NetworkManager:    SCPlugin-Ifupdown: devices added (path: /sys/devices/virtual/net/lo, iface: lo)

@

Since at least Jaunty, I've tried to get my wife's 3G USB modem to work on Ubuntu, always with the same result - instant, complete system freeze.

I've tried installing`wvdial and usb-modeswitch, I've read tons of documentation but it gets quite disjointed from one release to the next, nothing works. I can't run lsusb because the system hangs immediately.

I'm using Lucid and it's a Rogers "Rocket Stick" (in Canada)