Disconnect with non LTE capable provider

[Aleksander Morgado]

On Fri, Feb 7, 2014 at 4:50 PM, Guido Günther <agx at sigxcpu.org> wrote:
> Hi Aleksander,
> On Wed, Feb 05, 2014 at 11:23:05AM +0100, Aleksander Morgado wrote:
>> Hey Guido,
>>
>> Adding Ben and Franko in CC, who should be interested in this issue.
>>
>> > the umts modem in my laptop (Huawei ME906E) is LTE capable while my
>> > provider isn't. Whenever the modem sees LTE it tries to upgrade the
>> > connection and then disconnects:
>
> [..snip..]
>
>> > (but it's the same using NM). I wonder how to disable LTE for these
>> > situations and how to expose this in a user friendly way in NM since
>> > this might be a rather common problem.
>>
>> How about disallowing 4G temporarily? You could do:
>>   mmcli -m0  --set-allowed-modes="2g|3g"
>
> This results in
>
> error: couldn't set current modes: 'GDBus.Error:org.freedesktop.ModemManager1.Error.Core.Unsupported: Cannot change modes: only one combination supported'
>
> I tried this with 1.2.0 and current git master doesn't seem to have any
> changes in this section.
>
>> The ME906E should be happy with the latest SYSCFGEX changes I did for
>> allowed/preferred mode switching.
>
> It seems to support SYSCFGEX:
>
>     AT ^SYSCFGEX=?
>     ("00","03","02","01","99"),((2000004e80380,"GSM850/GSM900/GSM1800/GSM1900/WCDMA850/WCDMA900/WCDMA1900/WCDMA2100"),(3fffffff,"All Bands")),(0-3),(0-4),((800d7,"LTE1900/LTE2100/LTE2600/LTE1800/LTE900/LTEDD800/LTE850"),(7fffffffffffffff,"All Bands"))
>
> I've not dug deeper into this yet since the WWAN connection in this
> train is just too unreliable to do any proper readup on SYSCFGEX - what
> an irony.
>

Weird, can you get me debug logs? Also, what does mmcli -m 0 say?

-- 
Aleksander
https://aleksander.es