Cannot reconnect with E392



I'm using Ubuntu 12.04.2 with Huawei E392

When I plug the modem I can connect to the internet once. Here are some debug messages:

modem-manager[8215]: <debug> [1368538398.933359] [mm-generic-gsm.c:5813] simple_state_machine(): (ttyUSB0): simple connect state 5
modem-manager[8215]: <info> [1368538398.933503] [mm-modem.c:746] mm_modem_set_state(): Modem /org/freedesktop/ModemManager/Modems/0: state changed (registered -> connecting)
modem-manager[8215]: <debug> [1368538398.933546] [mm-at-serial-port.c:333] debug_log(): (ttyUSB0): --> 'ATD*99***8#<CR>'
modem-manager[8215]: <debug> [1368538398.952824] [mm-at-serial-port.c:333] debug_log(): (ttyUSB0): <-- '<CR><LF>CONNECT 43200000<CR><LF>'
modem-manager[8215]: <debug> [1368538398.952983] [mm-port.c:181] mm_port_set_connected(): (ttyUSB0): port now connected
modem-manager[8215]: <info> [1368538398.953085] [mm-modem.c:746] mm_modem_set_state(): Modem /org/freedesktop/ModemManager/Modems/0: state changed (connecting -> connected)
modem-manager[8215]: <debug> [1368538398.953120] [mm-generic-gsm.c:5813] simple_state_machine(): (ttyUSB0): simple connect state 6
modem-manager[8215]: <debug> [1368538399.036172] [mm-manager.c:793] device_added(): (net/ppp0): could not get port's parent device

So, until this point the internet connection works fine. I can make up/downloads without problems. Now I disconnect using the network manager "Verbindung Trennen". After this following can be seen in the log:

modem-manager[8215]: <debug> [1368538439.449699] [mm-at-serial-port.c:333] debug_log(): (ttyUSB0): <-- '~<CR><LF>NO CARRIER<CR><LF>c\210~'
modem-manager[8215]: <debug> [1368538439.449811] [mm-serial-parsers.c:438] mm_serial_parser_v1_parse(): Got failure code 3: No carrier
modem-manager[8215]: <debug> [1368538439.453083] [mm-serial-port.c:636] data_available(): (ttyUSB0) unexpected port hangup!
modem-manager[8215]: <debug> [1368538439.453150] [mm-serial-port.c:844] mm_serial_port_close(): (ttyUSB0) device open count is 0 (close)
modem-manager[8215]: <info> [1368538439.453166] [mm-serial-port.c:859] mm_serial_port_close(): (ttyUSB0) closing serial port...
modem-manager[8215]: <debug> [1368538439.453187] [mm-port.c:181] mm_port_set_connected(): (ttyUSB0): port now disconnected
modem-manager[8215]: <info> [1368538439.453372] [mm-serial-port.c:880] mm_serial_port_close(): (ttyUSB0) serial port closed
modem-manager[8215]: <info> [1368538439.592228] [mm-modem.c:746] mm_modem_set_state(): Modem /org/freedesktop/ModemManager/Modems/0: state changed (connected -> disconnecting)
modem-manager[8215]: <info> [1368538439.592338] [mm-modem.c:746] mm_modem_set_state(): Modem /org/freedesktop/ModemManager/Modems/0: state changed (disconnecting -> connected)

Then I want to reconnect to the internet, but it repeatedly fails:

modem-manager[8215]: <info> [1368538855.500204] [mm-modem.c:746] mm_modem_set_state(): Modem /org/freedesktop/ModemManager/Modems/0: state changed (connected -> disconnecting)
modem-manager[8215]: <info> [1368538855.500349] [mm-modem.c:746] mm_modem_set_state(): Modem /org/freedesktop/ModemManager/Modems/0: state changed (disconnecting -> connected)
modem-manager[8215]: <debug> [1368538855.601321] [mm-generic-gsm.c:5924] simple_connect(): (ttyUSB0): number => "*99#"
modem-manager[8215]: <debug> [1368538855.601396] [mm-generic-gsm.c:5924] simple_connect(): (ttyUSB0): pin => "3620"
modem-manager[8215]: <debug> [1368538855.601409] [mm-generic-gsm.c:5924] simple_connect(): (ttyUSB0): username => "ppp a1plus at"
modem-manager[8215]: <debug> [1368538855.601419] [mm-generic-gsm.c:5924] simple_connect(): (ttyUSB0): apn => "a1.net"
modem-manager[8215]: <debug> [1368538855.601435] [mm-generic-gsm.c:5924] simple_connect(): (ttyUSB0): network_mode => 0
modem-manager[8215]: <debug> [1368538855.601445] [mm-generic-gsm.c:5924] simple_connect(): (ttyUSB0): password => "ppp"
modem-manager[8215]: <debug> [1368538855.601457] [mm-generic-gsm.c:5924] simple_connect(): (ttyUSB0): allowed_mode => 0
modem-manager[8215]: <debug> [1368538855.601480] [mm-generic-gsm.c:5813] simple_state_machine(): (ttyUSB0): simple connect state 0
modem-manager[8215]: <debug> [1368538855.601515] [mm-generic-gsm.c:5813] simple_state_machine(): (ttyUSB0): simple connect state 2
modem-manager[8215]: <info> [1368538855.603571] [mm-modem.c:746] mm_modem_set_state(): Modem /org/freedesktop/ModemManager/Modems/0: state changed (connected -> disconnecting)
modem-manager[8215]: <info> [1368538855.603664] [mm-modem.c:746] mm_modem_set_state(): Modem /org/freedesktop/ModemManager/Modems/0: state changed (disconnecting -> connected)

What is the issue?


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