Hi,
I have a linux box running ubuntu 17.10. My wwan card is lenovo em 7455, which is currently running generic firmware 9999999_9904609_SWI9X30C_02.24.03.00_00_GENERIC_002.021_000 (I also tried 9999999_9904609_SWI9X30C_02.20.03.00_00_GENERIC_002.017_000 and it’s the same) with a sprint sim card with unlimited data plan. I have to use generic firmware if I use sprint firmware it will disconnect after a few minutes and will not reconnect even if I checked auto-reconnect in network-manager.
The symptom is my wwan keeps disconnecting every a few seconds, in network-manager I’m able to set it to auto reconnect but it will disconnect non-stop. Using “journalctl -xf | grep state” I can see the log
Aug 26 11:33:51 qwertyegg-STCK1A8LFC NetworkManager[765]: <info> [1503761631.6229] device (cdc-wdm2): state change: ip-config -> ip-check (reason 'none') [70 80 0]
Aug 26 11:33:51 qwertyegg-STCK1A8LFC NetworkManager[765]: <info> [1503761631.6262] device (cdc-wdm2): state change: ip-check -> secondaries (reason 'none') [80 90 0]
Aug 26 11:33:51 qwertyegg-STCK1A8LFC NetworkManager[765]: <info> [1503761631.6271] device (cdc-wdm2): state change: secondaries -> activated (reason 'none') [90 100 0]
Aug 26 11:33:59 qwertyegg-STCK1A8LFC ModemManager[798]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: state changed (connected -> registered)
Aug 26 11:33:59 qwertyegg-STCK1A8LFC NetworkManager[765]: <info> [1503761639.7887] (cdc-wdm2): modem state changed, 'connected' --> 'registered' (reason: user-requested)
Aug 26 11:33:59 qwertyegg-STCK1A8LFC NetworkManager[765]: <info> [1503761639.7889] device (cdc-wdm2): state change: activated -> failed (reason 'modem-no-carrier') [100 120 25]
Aug 26 11:33:59 qwertyegg-STCK1A8LFC NetworkManager[765]: <info> [1503761639.8516] device (cdc-wdm2): state change: failed -> disconnected (reason 'none') [120 30 0]
Aug 26 11:33:59 qwertyegg-STCK1A8LFC NetworkManager[765]: <info> [1503761639.8738] device (cdc-wdm2): state change: disconnected -> prepare (reason 'none') [30 40 0]
Aug 26 11:33:59 qwertyegg-STCK1A8LFC ModemManager[798]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: state changed (registered -> connecting)
Aug 26 11:33:59 qwertyegg-STCK1A8LFC NetworkManager[765]: <info> [1503761639.9226] (cdc-wdm2): modem state changed, 'registered' --> 'connecting' (reason: user-requested)
Aug 26 11:34:00 qwertyegg-STCK1A8LFC ModemManager[798]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: state changed (connecting -> connected)
Aug 26 11:34:00 qwertyegg-STCK1A8LFC NetworkManager[765]: <info> [1503761640.8453] (cdc-wdm2): modem state changed, 'connecting' --> 'connected' (reason: user-requested)
Aug 26 11:34:00 qwertyegg-STCK1A8LFC NetworkManager[765]: <info> [1503761640.8549] device (cdc-wdm2): state change: prepare -> config (reason 'none') [40 50 0]
Aug 26 11:34:00 qwertyegg-STCK1A8LFC NetworkManager[765]: <info> [1503761640.8560] device (cdc-wdm2): state change: config -> ip-config (reason 'none') [50 70 0]
Aug 26 11:34:00 qwertyegg-STCK1A8LFC NetworkManager[765]: <info> [1503761640.8710] device (cdc-wdm2): state change: ip-config -> ip-check (reason 'none') [70 80 0]
Aug 26 11:34:00 qwertyegg-STCK1A8LFC NetworkManager[765]: <info> [1503761640.8752] device (cdc-wdm2): state change: ip-check -> secondaries (reason 'none') [80 90 0]
Aug 26 11:34:00 qwertyegg-STCK1A8LFC NetworkManager[765]: <info> [1503761640.8824] device (cdc-wdm2): state change: secondaries -> activated (reason 'none') [90 100 0]
Aug 26 11:34:09 qwertyegg-STCK1A8LFC ModemManager[798]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: state changed (connected -> registered)
Aug 26 11:34:09 qwertyegg-STCK1A8LFC NetworkManager[765]: <info> [1503761649.4863] (cdc-wdm2): modem state changed, 'connected' --> 'registered' (reason: user-requested)
Aug 26 11:34:09 qwertyegg-STCK1A8LFC NetworkManager[765]: <info> [1503761649.4865] device (cdc-wdm2): state change: activated -> failed (reason 'modem-no-carrier') [100 120 25]
Aug 26 11:34:09 qwertyegg-STCK1A8LFC NetworkManager[765]: <info> [1503761649.5544] device (cdc-wdm2): state change: failed -> disconnected (reason '
It seems like this line is the problem
Aug 26 11:33:59 qwertyegg-STCK1A8LFC NetworkManager[765]: <info> [1503761639.7889] device (cdc-wdm2): state change: activated -> failed (reason 'modem-no-carrier') [100 120 25]
I tried to do some search myself but didn’t see much related topics. I appreciate anyone’s help.