USB_ModeSwitch • View topic - Huaweii E392/E398 Ndis interface

Hello,

I am having Problems with the e392/e398 NDIS interface.

It seems sometimes after some reconnects of the mobile the NDIS interface does not get recognized. The qmi_wwan module will not get the usb descriptor, but the option module instead.
Afterwards this will occur every reconnect until I unload the options module. It works again after this.

There is no regularity after how many reconnects this happens.

My question here now is: is it possible, that maybe usb_modeswitch is adding the ndis interface dynamcly to the options module, so the qmi_wwan will be prevented to initialize this?

what I see in the logs, in case the all went well:
(interface 1.2 is just a regular tty as an example. 1.3 should be the ndis device)

Code:

...
get_iface_id:641: option 1-4:1.2: static descriptor matches
get_iface_id:641: option 1-4:1.2: static descriptor matches
usb_serial_probe:766: option 1-4:1.2: found bulk in on endpoint 0
usb_serial_probe:775: option 1-4:1.2: found bulk out on endpoint 1
option 1-4:1.2: GSM modem (1-port) converter detected
usb_serial_probe:888: option 1-4:1.2: setting up 1 port structures for this device
allocate_minors:94: option 1-4:1.2: allocate_minors 1
usb_serial_probe:1054: option 1-4:1.2: registering ttyUSB2
usb 1-4: GSM modem (1-port) converter now attached to ttyUSB2
qmi_wwan 1-4:1.3: cdc-wdm1: USB WDM device
qmi_wwan 1-4:1.3 wwan1: register 'qmi_wwan' at usb-0000:00:12.2-4, WWAN/QMI device, 00:a0:c6:00:00:00
...

and the log in case it went wrong:

Code:

...
get_iface_id:641: option 1-4:1.2: static descriptor matches
get_iface_id:641: option 1-4:1.2: static descriptor matches
usb_serial_probe:766: option 1-4:1.2: found bulk in on endpoint 0
usb_serial_probe:775: option 1-4:1.2: found bulk out on endpoint 1
option 1-4:1.2: GSM modem (1-port) converter detected
usb_serial_probe:888: option 1-4:1.2: setting up 1 port structures for this device
allocate_minors:94: option 1-4:1.2: allocate_minors 1
usb_serial_probe:1054: option 1-4:1.2: registering ttyUSB2
usb 1-4: GSM modem (1-port) converter now attached to ttyUSB2
get_iface_id:646: option 1-4:1.3: dynamic descriptor matches
usb_serial_probe:784: option 1-4:1.3: found interrupt in on endpoint 0
option 1-4:1.3: GSM modem (1-port) converter detected
usb_serial_probe:888: option 1-4:1.3: setting up 1 port structures for this device
allocate_minors:94: option 1-4:1.3: allocate_minors 1
usb_serial_probe:1054: option 1-4:1.3: registering ttyUSB3
...

So somehow now the option module has a dynamic descriptor matching.
Can this be related to usb modeswitch? If yes, do you need any more information to help there or give me a pointer to where to look to fix this?

Kind Regards
Ricardo

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