Disconnect with non LTE capable provider

Guido Günther agx at sigxcpu.org
Wed Feb 5 08:11:10 CET 2014

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:

ModemManager[3010]: <info>  Modem /org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state changed (home -> idle)
ModemManager[3010]: <info>  Modem /org/freedesktop/ModemManager1/Modem/0: 3GPP location updated (MCC: '0', MNC: '0', Location area code: '0', Cell ID: '0')
ModemManager[3010]: <info>  Modem /org/freedesktop/ModemManager1/Modem/0: access technology changed (umts -> lte)
ModemManager[3010]: <info>  Modem /org/freedesktop/ModemManager1/Modem/0: signal quality updated (26)
ModemManager[3010]: <info>  Modem /org/freedesktop/ModemManager1/Modem/0: state changed (connected -> disconnecting)

This is ModemManger 1.2 and connected via

    mmcli -v -m 0 --simple-connect="apn=internet"

(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.
 -- Guido

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