On Mon, 2017-11-20 at 10:41 +0100, Bjørn Mork wrote: > Shrirang Bagul <shrirang.ba...@canonical.com> writes: > > > Dell Wireless 5819/5818 devices are re-branded Sierra Wireless MC74 > > series modems which will by default boot with vid 0x413c and pid's > > 0x81cf, 0x81d0, 0x81d1,0x81d2. Along with qcserial, these modems support > > qmi_wwan on the usb interface #12. > > NAK, > > Interace #12 is MBIM, as shown by the device descriptors. Please provide > those descriptors and you will see that this interface is clearly a CDC > MBIM class interface. > > Yes, I know these modems probe the control protocol so that you can make > QMI work on an MBIM control interface by sending it a QMI request as the > first messsage. This is still wrong, abusing a quirky firmware > feature. > > You need to reconfigure the modem for QMI using the Sierra specific AT > command or QMI request (tunneled in MBIM!) to properly switch it to QMI > mode, which will appear as a vendor specific interface number 8 (and 10 > if you enable both QMI functions). Understood. Needs more work, will resend with fixes.
- Shrirang > > > > > > Bjørn
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