HP lt4120 failing to make single-stack connections on LTE using MM

[Aleksander Morgado]

On Thu, Sep 6, 2018 at 11:29 AM, Tore Anderson <tore at fud.no> wrote:
> * Aleksander Morgado
>
>> Oh wait, this is a Intel based MBIM modem, right? If so, we need
>> AT-based reset operations. I believe I still have the HPlt4120 around
>> here, will try to implement that. Tracking it here:
>> https://gitlab.freedesktop.org/mobile-broadband/ModemManager/issues/86
>
> I don't really know, to be honest. I'm using qmicli to manage it and that
> works (including «--dms-set-operating-mode=foo»). ModemManager says it's
> MBIM, however. Is MBIM/QMI an either/or thing? It seems to me that this
> modem is both.
>
>   -------------------------
>   Hardware |   manufacturer: 'HP'
>            |          model: 'MBIM [03F0:9D1D]'
>            |       revision: 'T77W595.F0.0.0.6.6.GC.029'
>            |   H/W revision: 'HP lt4120 Snapdragon X5 LTE'
>            |      supported: 'gsm-umts, lte'
>            |        current: 'gsm-umts, lte'
>            |   equipment id: '358894065774253'
>   -------------------------
>   System   |         device: '/sys/devices/pci0000:00/0000:00:14.0/usb1/1-3'
>            |        drivers: 'cdc_mbim'
>            |         plugin: 'Generic'
>            |   primary port: 'cdc-wdm0'
>            |          ports: 'cdc-wdm0 (mbim), wwp0s20f0u3c3 (net)'
>   -------------------------
>

Ok, then no, this is not Intel based, it's Qualcomm based. And now
that I recall, this is the one for which the firmware upgrade is done
using PDC service.
It is indeed doing QMI over MBIM, if you're using qmicli nicely. I now
wonder why the reset operation didn't work for you.


-- 
Aleksander
https://aleksander.es