Re: Pantech UML290 - 106c:3718 - QMI Modem

[Dan Williams <dcbw redhat com>]

On Mon, 2017-11-20 at 11:04 -0600, Dan Williams wrote:
> On Fri, 2017-11-17 at 08:48 -0600, Greg Oliver wrote:
> > On Fri, Nov 17, 2017 at 2:34 AM, Aleksander Morgado <
> > aleksander aleksander es> wrote:
> >
> > > On Fri, Nov 17, 2017 at 12:44 AM, Greg Oliver <oliver.greg@gmail.
> > > co
> > > m>
> > > wrote:
> > > > On Thu, Nov 16, 2017 at 2:57 PM, Aleksander Morgado
> > > > <aleksander aleksander es> wrote:
> >
> > [snip]
> >
> >
> > > > [greg@dell-wifi ~]$ sudo mmcli -m 0
> > > >
> > > > /org/freedesktop/ModemManager1/Modem/0 (device id
> > > > '48d4cf9eceb8dbb2de4e13da073cb011be31f29e')
> > > >   -------------------------
> > > >   Hardware |   manufacturer: 'QUALCOMM INCORPORATED'
> > > >            |          model: '42'
> > > >            |       revision: 'L0290VWBB12F.248  1  [Nov  9 2011
> > >
> > > 08:44:21]'
> > > >            |      supported: 'gsm-umts
> > > >            |                  cdma-evdo
> > > >            |                  lte
> > > >            |                  cdma-evdo, gsm-umts
> > > >            |                  gsm-umts, lte
> > > >            |                  cdma-evdo, lte
> > > >            |                  cdma-evdo, gsm-umts, lte'
> > > >            |        current: 'cdma-evdo'
> > >
> > > So this is being managed in QMI, which is ok, but as seen above
> > > the
> > > "current" mode is limited to cdma-evdo for some reason (i.e. no
> > > LTE).
> > >
> > > Can you try to run this?
> > > mmcli -m 0 --set-current-capabilities="cdma-evdo|lte"
> > >
> > > The device should reboot after that; then re-run "mmcli -m X" (X
> > > will
> > > likely be 1 after the reboot) and see if the "current" field
> > > shows
> > > "lte" as well.
> > >
> > > [snip]
> >
> > [greg@dell-wifi ~]$ sudo mmcli -m 0
> > --set-current-capabilities="cdma-evdo|lte"
> > error: couldn't set current capabilities:
> > 'GDBus.Error:org.freedesktop.ModemManager1.Error.Core.Unsupported:
> > Setting
> > capabilities is not supported by this device'
>
> You may not actually be able to change the capabilities in
> ModemManager, I don't recall exactly why and I thought we'd fixed it,
> but perhaps just use qmicli for the time being.
>
> The UML290 is a bit particular in the options it wants, so try this
> (it
> works on my 290...)
>
> sudo qmicli -p -d /dev/cdc-wdm1 --nas-set-system-selection-
> preference="cdma-1x|cdma-1xevdo|gsm|umts|lte"

And sorry, you want /dev/cdc-wdm0 here.  I already had a QMI device
plugged in, thus the UML290 got cdc-wdm1 for me...

> > I am asking the guy I am incorporating this for to check his plan
> > to
> > see if
> > his SIM card plan is even LTE capable.  He is switching from T-
> > Mobile 
> > 2g on
> > his devices (since they are disbanding that network) to
> > Verizon.  I'll post
> > back when I hear, but your earlier comment that evdo does not take
> > APNs
> > took me by surprise.  I have never used 3rd party network
> > subscriptions
> > before until this guy, but what you are saying is that when using
> > PPP
> > on
> > evdo networks there is no APN concept like in GSM?  His original
> > line
> > of
>
> That's correct.  Verizon is still a hybrid CDMA/EVDO (which doesn't
> use
> APNs at all) and LTE (which does) network.  Your modem was originally
> in CDMA/EVDO mode with LTE disabled, and thus NetworkManager would
> not
> allow APN entry because it would be useless as CDMA doesn't use one.
>
> But if you switch the device with the above command to enable LTE as
> well, then you can enter the APN which will be used when the device
> attaches to the Verizon LTE network.
>
> (I could go into what it does when it's dual-mode CDMA/EVDO + LTE,
> but
> that's a much longer mail).
>
> If that works and you can use your APN, great.  If it doesn't work,
> or
> handoff between LTE and CDMA/EVDO doesn't work for you, let us know
> because there's one more setting that needs to be on for dual-mode to
> work correctly (eHRPD).
>
> > product on T-Mobile 2g was able to use 3rd party APNs just fine - I
> > did not
> > know the backend of the 2 technologies were that much different
> > other
> > than
> > the framing used - guess I need to read up more.
>
> They are a ton different :)  CDMA/EVDO store more of the subscriber
> information with the carrier, thus you don't use APNs or SIM cards.
>
> Dan
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