I've removed the reference to the duplicate bug as it doesn't exist anymore. The issue is affecting my system as well. I have an HP hs2300 HSDPA Broadband Wireless Module (Sierra MC8775). Since 13.04 the modem-manager cannot start anymore. NetworkManager is 0.9.8.0 whilst modemmanager is 0.6.0.0 This is an extract from the syslog (basically the modem-manager starts and dies in an infinite loop): Aug 4 11:45:28 TSLAsus dbus[1172]: [system] Activating service name='org.freedesktop.ModemManager' (using servicehelper) Aug 4 11:45:28 TSLAsus modem-manager[2582]: ModemManager (version 0.6.0.0) starting... Aug 4 11:45:28 TSLAsus dbus[1172]: [system] Successfully activated service 'org.freedesktop.ModemManager' Aug 4 11:45:28 TSLAsus NetworkManager[1244]: modem-manager is now available Aug 4 11:45:28 TSLAsus modem-manager[2582]: Loaded plugin 'Sierra' Aug 4 11:45:28 TSLAsus modem-manager[2582]: Loaded plugin 'Novatel' Aug 4 11:45:28 TSLAsus modem-manager[2582]: Loaded plugin 'Longcheer' Aug 4 11:45:28 TSLAsus modem-manager[2582]: Loaded plugin 'Linktop' Aug 4 11:45:28 TSLAsus modem-manager[2582]: Loaded plugin 'Nokia' Aug 4 11:45:28 TSLAsus modem-manager[2582]: Loaded plugin 'Option High-Speed' Aug 4 11:45:28 TSLAsus modem-manager[2582]: Loaded plugin 'X22X' Aug 4 11:45:28 TSLAsus modem-manager[2582]: Loaded plugin 'Wavecom' Aug 4 11:45:28 TSLAsus modem-manager[2582]: Loaded plugin 'Ericsson MBM' Aug 4 11:45:28 TSLAsus modem-manager[2582]: Loaded plugin 'SimTech' Aug 4 11:45:28 TSLAsus modem-manager[2582]: Loaded plugin 'ZTE' Aug 4 11:45:28 TSLAsus modem-manager[2582]: Loaded plugin 'Gobi' Aug 4 11:45:28 TSLAsus modem-manager[2582]: Loaded plugin 'MotoC' Aug 4 11:45:28 TSLAsus modem-manager[2582]: Loaded plugin 'Huawei' Aug 4 11:45:28 TSLAsus modem-manager[2582]: Loaded plugin 'Samsung' Aug 4 11:45:28 TSLAsus modem-manager[2582]: Loaded plugin 'AnyData' Aug 4 11:45:28 TSLAsus modem-manager[2582]: Loaded plugin 'Option' Aug 4 11:45:28 TSLAsus modem-manager[2582]: Loaded plugin 'Iridium' Aug 4 11:45:28 TSLAsus modem-manager[2582]: Loaded plugin 'Cinterion' Aug 4 11:45:28 TSLAsus modem-manager[2582]: Loaded plugin 'Generic' Aug 4 11:45:28 TSLAsus modem-manager[2582]: Successfully loaded 20 plugins Aug 4 11:45:28 TSLAsus modem-manager[2582]: (ttyUSB0) opening serial port... Aug 4 11:45:28 TSLAsus modem-manager[2582]: (ttyUSB0): port attributes not fully set Aug 4 11:45:28 TSLAsus modem-manager[2582]: (ttyUSB1) opening serial port... Aug 4 11:45:28 TSLAsus modem-manager[2582]: (ttyUSB1): port attributes not fully set Aug 4 11:45:28 TSLAsus modem-manager[2582]: (ttyUSB2) opening serial port... Aug 4 11:45:28 TSLAsus modem-manager[2582]: (ttyUSB2): port attributes not fully set Aug 4 11:45:31 TSLAsus modem-manager[2582]: (ttyUSB0) opening serial port... Aug 4 11:45:31 TSLAsus modem-manager[2582]: (ttyUSB0): port attributes not fully set Aug 4 11:45:32 TSLAsus modem-manager[2582]: (ttyUSB2) closing serial port... Aug 4 11:45:32 TSLAsus modem-manager[2582]: (ttyUSB2) serial port closed Aug 4 11:45:32 TSLAsus modem-manager[2582]: (Sierra): GSM modem /sys/devices/pci0000:00/0000:00:1a.1/usb4/4-1 claimed port ttyUSB2 Aug 4 11:45:40 TSLAsus modem-manager[2582]: (ttyUSB1) closing serial port... Aug 4 11:45:40 TSLAsus modem-manager[2582]: (ttyUSB1) serial port closed Aug 4 11:45:40 TSLAsus modem-manager[2582]: (ttyUSB1) opening serial port... Aug 4 11:45:43 TSLAsus modem-manager[2582]: (ttyUSB0) closing serial port... Aug 4 11:45:43 TSLAsus modem-manager[2582]: (ttyUSB0) serial port closed Aug 4 11:45:43 TSLAsus modem-manager[2582]: (ttyUSB0) opening serial port... Aug 4 11:45:46 TSLAsus modem-manager[2582]: (ttyUSB1) closing serial port... Aug 4 11:45:46 TSLAsus modem-manager[2582]: (ttyUSB1) serial port closed Aug 4 11:45:49 TSLAsus modem-manager[2582]: (ttyUSB0) closing serial port... Aug 4 11:45:49 TSLAsus modem-manager[2582]: (ttyUSB0) serial port closed Aug 4 11:45:49 TSLAsus NetworkManager[1244]: the modem manager disappeared Aug 4 11:45:49 TSLAsus dbus[1172]: [system] Activating service name='org.freedesktop.ModemManager' (using servicehelper) Aug 4 11:45:49 TSLAsus modem-manager[3346]: ModemManager (version 0.6.0.0) starting... Aug 4 11:45:49 TSLAsus dbus[1172]: [system] Successfully activated service 'org.freedesktop.ModemManager' Aug 4 11:45:49 TSLAsus NetworkManager[1244]: modem-manager is now available Aug 4 11:45:49 TSLAsus modem-manager[3346]: Loaded plugin 'Sierra' Aug 4 11:45:49 TSLAsus modem-manager[3346]: Loaded plugin 'Novatel' Aug 4 11:45:49 TSLAsus modem-manager[3346]: Loaded plugin 'Longcheer' Aug 4 11:45:49 TSLAsus modem-manager[3346]: Loaded plugin 'Linktop' Aug 4 11:45:49 TSLAsus modem-manager[3346]: Loaded plugin 'Nokia' Aug 4 11:45:49 TSLAsus modem-manager[3346]: Loaded plugin 'Option High-Speed' Aug 4 11:45:49 TSLAsus modem-manager[3346]: Loaded plugin 'X22X' Aug 4 11:45:49 TSLAsus modem-manager[3346]: Loaded plugin 'Wavecom' Aug 4 11:45:49 TSLAsus modem-manager[3346]: Loaded plugin 'Ericsson MBM' Aug 4 11:45:49 TSLAsus modem-manager[3346]: Loaded plugin 'SimTech' Aug 4 11:45:49 TSLAsus modem-manager[3346]: Loaded plugin 'ZTE' Aug 4 11:45:49 TSLAsus modem-manager[3346]: Loaded plugin 'Gobi' Aug 4 11:45:49 TSLAsus modem-manager[3346]: Loaded plugin 'MotoC' Aug 4 11:45:49 TSLAsus modem-manager[3346]: Loaded plugin 'Huawei' Aug 4 11:45:49 TSLAsus modem-manager[3346]: Loaded plugin 'Samsung' Aug 4 11:45:49 TSLAsus modem-manager[3346]: Loaded plugin 'AnyData' Aug 4 11:45:49 TSLAsus modem-manager[3346]: Loaded plugin 'Option' Aug 4 11:45:49 TSLAsus modem-manager[3346]: Loaded plugin 'Iridium' Aug 4 11:45:49 TSLAsus modem-manager[3346]: Loaded plugin 'Cinterion' Aug 4 11:45:49 TSLAsus modem-manager[3346]: Loaded plugin 'Generic' Aug 4 11:45:49 TSLAsus modem-manager[3346]: Successfully loaded 20 plugins Aug 4 11:45:49 TSLAsus modem-manager[3346]: (ttyUSB0) opening serial port... Aug 4 11:45:49 TSLAsus modem-manager[3346]: (ttyUSB0): port attributes not fully set Aug 4 11:45:49 TSLAsus modem-manager[3346]: (ttyUSB1) opening serial port... Aug 4 11:45:49 TSLAsus modem-manager[3346]: (ttyUSB1): port attributes not fully set Aug 4 11:45:49 TSLAsus modem-manager[3346]: (ttyUSB2) opening serial port... Aug 4 11:45:49 TSLAsus modem-manager[3346]: (ttyUSB2): port attributes not fully set Aug 4 11:45:52 TSLAsus modem-manager[3346]: (ttyUSB0) opening serial port... Aug 4 11:45:52 TSLAsus modem-manager[3346]: (ttyUSB0): port attributes not fully set Aug 4 11:45:53 TSLAsus modem-manager[3346]: (ttyUSB2) closing serial port... Aug 4 11:45:53 TSLAsus modem-manager[3346]: (ttyUSB2) serial port closed Aug 4 11:45:53 TSLAsus modem-manager[3346]: (Sierra): GSM modem /sys/devices/pci0000:00/0000:00:1a.1/usb4/4-1 claimed port ttyUSB2 Aug 4 11:46:01 TSLAsus modem-manager[3346]: (ttyUSB1) closing serial port... Aug 4 11:46:01 TSLAsus modem-manager[3346]: (ttyUSB1) serial port closed Aug 4 11:46:01 TSLAsus modem-manager[3346]: (ttyUSB1) opening serial port... Aug 4 11:46:04 TSLAsus modem-manager[3346]: (ttyUSB0) closing serial port... Aug 4 11:46:04 TSLAsus modem-manager[3346]: (ttyUSB0) serial port closed Aug 4 11:46:04 TSLAsus modem-manager[3346]: (ttyUSB0) opening serial port... I've killed modem-manager and re-run it with --debug switch. The output is: modem-manager[17535]: [1375610973.179700] [main.c:167] main(): ModemManager (version 0.6.0.0) starting... modem-manager[17535]: [1375610973.185750] [mm-manager.c:158] found_plugin(): Loaded plugin 'Sierra' modem-manager[17535]: [1375610973.185804] [mm-manager.c:158] found_plugin(): Loaded plugin 'Novatel' modem-manager[17535]: [1375610973.185964] [mm-manager.c:158] found_plugin(): Loaded plugin 'Longcheer' modem-manager[17535]: [1375610973.186042] [mm-manager.c:158] found_plugin(): Loaded plugin 'Linktop' modem-manager[17535]: [1375610973.186108] [mm-manager.c:158] found_plugin(): Loaded plugin 'Nokia' modem-manager[17535]: [1375610973.186171] [mm-manager.c:158] found_plugin(): Loaded plugin 'Option High-Speed' modem-manager[17535]: [1375610973.186341] [mm-manager.c:158] found_plugin(): Loaded plugin 'X22X' modem-manager[17535]: [1375610973.186362] [mm-manager.c:158] found_plugin(): Loaded plugin 'Wavecom' modem-manager[17535]: [1375610973.186425] [mm-manager.c:158] found_plugin(): Loaded plugin 'Ericsson MBM' modem-manager[17535]: [1375610973.186497] [mm-manager.c:158] found_plugin(): Loaded plugin 'SimTech' modem-manager[17535]: [1375610973.186516] [mm-manager.c:158] found_plugin(): Loaded plugin 'ZTE' modem-manager[17535]: [1375610973.186547] [mm-manager.c:158] found_plugin(): Loaded plugin 'Gobi' modem-manager[17535]: [1375610973.186579] [mm-manager.c:158] found_plugin(): Loaded plugin 'MotoC' modem-manager[17535]: [1375610973.186608] [mm-manager.c:158] found_plugin(): Loaded plugin 'Huawei' modem-manager[17535]: [1375610973.186638] [mm-manager.c:158] found_plugin(): Loaded plugin 'Samsung' modem-manager[17535]: [1375610973.186667] [mm-manager.c:158] found_plugin(): Loaded plugin 'AnyData' modem-manager[17535]: [1375610973.186725] [mm-manager.c:158] found_plugin(): Loaded plugin 'Option' modem-manager[17535]: [1375610973.186755] [mm-manager.c:158] found_plugin(): Loaded plugin 'Iridium' modem-manager[17535]: [1375610973.186785] [mm-manager.c:158] found_plugin(): Loaded plugin 'Cinterion' modem-manager[17535]: [1375610973.186814] [mm-manager.c:158] found_plugin(): Loaded plugin 'Generic' modem-manager[17535]: [1375610973.186846] [mm-manager.c:210] load_plugins(): Successfully loaded 20 plugins modem-manager[17535]: [1375610973.187189] [mm-manager.c:1057] mm_manager_start(): Starting device scan... modem-manager[17535]: [1375610973.193719] [mm-manager.c:875] device_added(): (tty/ttyS0): port's parent platform driver is not whitelisted modem-manager[17535]: [1375610973.194019] [mm-manager.c:875] device_added(): (tty/ttyS1): port's parent platform driver is not whitelisted modem-manager[17535]: [1375610973.194358] [mm-manager.c:875] device_added(): (tty/ttyS10): port's parent platform driver is not whitelisted modem-manager[17535]: [1375610973.194570] [mm-manager.c:875] device_added(): (tty/ttyS11): port's parent platform driver is not whitelisted modem-manager[17535]: [1375610973.194739] [mm-manager.c:875] device_added(): (tty/ttyS12): port's parent platform driver is not whitelisted modem-manager[17535]: [1375610973.194962] [mm-manager.c:875] device_added(): (tty/ttyS13): port's parent platform driver is not whitelisted modem-manager[17535]: [1375610973.195185] [mm-manager.c:875] device_added(): (tty/ttyS14): port's parent platform driver is not whitelisted modem-manager[17535]: [1375610973.195405] [mm-manager.c:875] device_added(): (tty/ttyS15): port's parent platform driver is not whitelisted modem-manager[17535]: [1375610973.195630] [mm-manager.c:875] device_added(): (tty/ttyS16): port's parent platform driver is not whitelisted modem-manager[17535]: [1375610973.195852] [mm-manager.c:875] device_added(): (tty/ttyS17): port's parent platform driver is not whitelisted modem-manager[17535]: [1375610973.196061] [mm-manager.c:875] device_added(): (tty/ttyS18): port's parent platform driver is not whitelisted modem-manager[17535]: [1375610973.196273] [mm-manager.c:875] device_added(): (tty/ttyS19): port's parent platform driver is not whitelisted modem-manager[17535]: [1375610973.196492] [mm-manager.c:875] device_added(): (tty/ttyS2): port's parent platform driver is not whitelisted modem-manager[17535]: [1375610973.196665] [mm-manager.c:875] device_added(): (tty/ttyS20): port's parent platform driver is not whitelisted modem-manager[17535]: [1375610973.196967] [mm-manager.c:875] device_added(): (tty/ttyS21): port's parent platform driver is not whitelisted modem-manager[17535]: [1375610973.197209] [mm-manager.c:875] device_added(): (tty/ttyS22): port's parent platform driver is not whitelisted modem-manager[17535]: [1375610973.197422] [mm-manager.c:875] device_added(): (tty/ttyS23): port's parent platform driver is not whitelisted modem-manager[17535]: [1375610973.197647] [mm-manager.c:875] device_added(): (tty/ttyS24): port's parent platform driver is not whitelisted modem-manager[17535]: [1375610973.197869] [mm-manager.c:875] device_added(): (tty/ttyS25): port's parent platform driver is not whitelisted modem-manager[17535]: [1375610973.198089] [mm-manager.c:875] device_added(): (tty/ttyS26): port's parent platform driver is not whitelisted modem-manager[17535]: [1375610973.198328] [mm-manager.c:875] device_added(): (tty/ttyS27): port's parent platform driver is not whitelisted modem-manager[17535]: [1375610973.198499] [mm-manager.c:875] device_added(): (tty/ttyS28): port's parent platform driver is not whitelisted modem-manager[17535]: [1375610973.198721] [mm-manager.c:875] device_added(): (tty/ttyS29): port's parent platform driver is not whitelisted modem-manager[17535]: [1375610973.198942] [mm-manager.c:875] device_added(): (tty/ttyS3): port's parent platform driver is not whitelisted modem-manager[17535]: [1375610973.199160] [mm-manager.c:875] device_added(): (tty/ttyS30): port's parent platform driver is not whitelisted modem-manager[17535]: [1375610973.199380] [mm-manager.c:875] device_added(): (tty/ttyS31): port's parent platform driver is not whitelisted modem-manager[17535]: [1375610973.199600] [mm-manager.c:875] device_added(): (tty/ttyS4): port's parent platform driver is not whitelisted modem-manager[17535]: [1375610973.199819] [mm-manager.c:875] device_added(): (tty/ttyS5): port's parent platform driver is not whitelisted modem-manager[17535]: [1375610973.200001] [mm-manager.c:875] device_added(): (tty/ttyS6): port's parent platform driver is not whitelisted modem-manager[17535]: [1375610973.200182] [mm-manager.c:875] device_added(): (tty/ttyS7): port's parent platform driver is not whitelisted modem-manager[17535]: [1375610973.200339] [mm-manager.c:875] device_added(): (tty/ttyS8): port's parent platform driver is not whitelisted modem-manager[17535]: [1375610973.200458] [mm-manager.c:875] device_added(): (tty/ttyS9): port's parent platform driver is not whitelisted modem-manager[17535]: [1375610973.201239] [mm-manager.c:859] device_added(): (tty/ttyprintk): could not get port's parent device modem-manager[17535]: [1375610973.208836] [mm-manager.c:1075] mm_manager_start(): Finished device scan... modem-manager[17535]: [1375610973.208920] [mm-serial-port.c:805] mm_serial_port_open(): (ttyUSB0) opening serial port... modem-manager[17535]: [1375610973.214331] [mm-serial-port.c:407] real_config_fd(): (ttyUSB0): port attributes not fully set modem-manager[17535]: [1375610973.214417] [mm-serial-port.c:874] mm_serial_port_open(): (ttyUSB0) device open count is 1 (open) modem-manager[17535]: [1375610973.214493] [mm-plugin-base.c:1065] try_open(): (ttyUSB0): probe requested by plugin 'Sierra' modem-manager[17535]: [1375610973.215366] [mm-serial-port.c:805] mm_serial_port_open(): (ttyUSB1) opening serial port... modem-manager[17535]: [1375610973.219354] [mm-serial-port.c:407] real_config_fd(): (ttyUSB1): port attributes not fully set modem-manager[17535]: [1375610973.219426] [mm-serial-port.c:874] mm_serial_port_open(): (ttyUSB1) device open count is 1 (open) modem-manager[17535]: [1375610973.219494] [mm-plugin-base.c:1065] try_open(): (ttyUSB1): probe requested by plugin 'Sierra' modem-manager[17535]: [1375610973.220357] [mm-serial-port.c:805] mm_serial_port_open(): (ttyUSB2) opening serial port... modem-manager[17535]: [1375610973.224967] [mm-serial-port.c:407] real_config_fd(): (ttyUSB2): port attributes not fully set modem-manager[17535]: [1375610973.225132] [mm-serial-port.c:874] mm_serial_port_open(): (ttyUSB2) device open count is 1 (open) modem-manager[17535]: [1375610973.225353] [mm-plugin-base.c:1065] try_open(): (ttyUSB2): probe requested by plugin 'Sierra' modem-manager[17535]: [1375610973.316402] [mm-at-serial-port.c:334] debug_log(): (ttyUSB0): --> 'AT+GCAP' modem-manager[17535]: [1375610973.321347] [mm-at-serial-port.c:334] debug_log(): (ttyUSB1): --> 'AT+GCAP' modem-manager[17535]: [1375610973.327385] [mm-at-serial-port.c:334] debug_log(): (ttyUSB2): --> 'AT+GCAP' modem-manager[17535]: [1375610974.018382] [mm-at-serial-port.c:334] debug_log(): (ttyUSB0): <-- 'OK' modem-manager[17535]: [1375610974.027552] [mm-at-serial-port.c:334] debug_log(): (ttyUSB2): <-- 'AT+GCAP' modem-manager[17535]: [1375610974.027720] [mm-at-serial-port.c:334] debug_log(): (ttyUSB0): --> 'AT+GCAP' modem-manager[17535]: [1375610974.029381] [mm-at-serial-port.c:334] debug_log(): (ttyUSB2): <-- '' modem-manager[17535]: [1375610974.030507] [mm-at-serial-port.c:334] debug_log(): (ttyUSB2): <-- 'ERROR' modem-manager[17535]: [1375610974.030638] [mm-serial-parsers.c:448] mm_serial_parser_v1_parse(): Got failure code 100: Unknown error modem-manager[17535]: [1375610974.030811] [mm-at-serial-port.c:334] debug_log(): (ttyUSB2): --> 'AT+GCAP' modem-manager[17535]: [1375610974.729388] [mm-at-serial-port.c:334] debug_log(): (ttyUSB0): <-- 'OK' modem-manager[17535]: [1375610974.731076] [mm-at-serial-port.c:334] debug_log(): (ttyUSB2): <-- 'AT+GCAP' modem-manager[17535]: [1375610974.731179] [mm-at-serial-port.c:334] debug_log(): (ttyUSB0): --> 'AT+GCAP' modem-manager[17535]: [1375610974.732463] [mm-at-serial-port.c:334] debug_log(): (ttyUSB2): <-- 'ERROR' modem-manager[17535]: [1375610974.732553] [mm-serial-parsers.c:448] mm_serial_parser_v1_parse(): Got failure code 100: Unknown error modem-manager[17535]: [1375610974.732710] [mm-at-serial-port.c:334] debug_log(): (ttyUSB2): --> 'AT+GCAP' modem-manager[17535]: [1375610975.432877] [mm-at-serial-port.c:334] debug_log(): (ttyUSB2): <-- 'AT+GCAP' modem-manager[17535]: [1375610975.433434] [mm-at-serial-port.c:334] debug_log(): (ttyUSB0): <-- 'OK' modem-manager[17535]: [1375610975.433621] [mm-at-serial-port.c:334] debug_log(): (ttyUSB0): --> 'ATI' modem-manager[17535]: [1375610975.434434] [mm-at-serial-port.c:334] debug_log(): (ttyUSB2): <-- '' modem-manager[17535]: [1375610975.435425] [mm-at-serial-port.c:334] debug_log(): (ttyUSB2): <-- 'ERROR' modem-manager[17535]: [1375610975.435509] [mm-serial-parsers.c:448] mm_serial_parser_v1_parse(): Got failure code 100: Unknown error modem-manager[17535]: [1375610975.435688] [mm-at-serial-port.c:334] debug_log(): (ttyUSB2): --> 'ATI' modem-manager[17535]: [1375610975.735365] [mm-at-serial-port.c:334] debug_log(): (ttyUSB0): <-- 'Sierra Wireless, Inc.MC8775APP1' modem-manager[17535]: [1375610975.735795] [mm-at-serial-port.c:334] debug_log(): (ttyUSB2): <-- 'ATI' modem-manager[17535]: [1375610975.736429] [mm-at-serial-port.c:334] debug_log(): (ttyUSB0): <-- 'OK' modem-manager[17535]: [1375610975.739004] [mm-at-serial-port.c:334] debug_log(): (ttyUSB2): <-- '' modem-manager[17535]: [1375610975.739082] [mm-serial-port.c:805] mm_serial_port_open(): (ttyUSB0) opening serial port... modem-manager[17535]: [1375610975.741382] [mm-serial-port.c:407] real_config_fd(): (ttyUSB0): port attributes not fully set modem-manager[17535]: [1375610975.741459] [mm-serial-port.c:874] mm_serial_port_open(): (ttyUSB0) device open count is 1 (open) modem-manager[17535]: [1375610975.741600] [mm-plugin-base.c:1065] try_open(): (ttyUSB0): probe requested by plugin 'Iridium' modem-manager[17535]: [1375610975.742441] [mm-at-serial-port.c:334] debug_log(): (ttyUSB2): <-- 'Manufacturer: Sierra Wireless, Inc.Model: MC8775Revision: H2_0_8_19MCAP G:/WS/FW/H2_0_8_19MCAP/MSM6280/SRC 2008/08/29 18:28:52IMEI: 352905014553782IMEI SV: 13FSN: D2835980005103GPP Release 5+GCAP: +CGSM,+DS,+ESOK' modem-manager[17535]: [1375610975.742663] [mm-at-serial-port.c:334] debug_log(): (ttyUSB2): --> 'AT+CGMI' modem-manager[17535]: [1375610976.443623] [mm-at-serial-port.c:334] debug_log(): (ttyUSB2): <-- 'AT+CGMI' modem-manager[17535]: [1375610976.443726] [mm-at-serial-port.c:334] debug_log(): (ttyUSB0): --> 'AT+GCAP' modem-manager[17535]: [1375610976.445437] [mm-at-serial-port.c:334] debug_log(): (ttyUSB2): <-- '' modem-manager[17535]: [1375610976.446435] [mm-at-serial-port.c:334] debug_log(): (ttyUSB2): <-- 'Sierra Wireless, Inc.OK' modem-manager[17535]: [1375610976.446644] [mm-at-serial-port.c:334] debug_log(): (ttyUSB2): --> 'AT+CGMM' modem-manager[17535]: [1375610977.146395] [mm-at-serial-port.c:334] debug_log(): (ttyUSB0): <-- 'OK' modem-manager[17535]: [1375610977.146819] [mm-at-serial-port.c:334] debug_log(): (ttyUSB2): <-- 'AT+CGMM' modem-manager[17535]: [1375610977.148452] [mm-at-serial-port.c:334] debug_log(): (ttyUSB2): <-- '' modem-manager[17535]: [1375610977.150353] [mm-at-serial-port.c:334] debug_log(): (ttyUSB2): <-- 'MC8775OK' modem-manager[17535]: [1375610977.150620] [mm-serial-port.c:908] mm_serial_port_close(): (ttyUSB2) device open count is 0 (close) modem-manager[17535]: [1375610977.150749] [mm-serial-port.c:923] mm_serial_port_close(): (ttyUSB2) closing serial port... modem-manager[17535]: [1375610977.160410] [mm-serial-port.c:944] mm_serial_port_close(): (ttyUSB2) serial port closed modem-manager[17535]: [1375610977.164401] [mm-modem-base.c:927] grab_port(): (ttyUSB2) type AT claimed by /sys/devices/pci0000:00/0000:00:1a.1/usb4/4-1 modem-manager[17535]: [1375610977.164726] [mm-manager.c:630] do_grab_port(): (Sierra): GSM modem /sys/devices/pci0000:00/0000:00:1a.1/usb4/4-1 claimed port ttyUSB2 modem-manager[17535]: [1375610977.164845] [mm-manager.c:362] add_modem(): Added modem /sys/devices/pci0000:00/0000:00:1a.1/usb4/4-1 modem-manager[17535]: [1375610977.164972] [mm-manager.c:298] check_export_modem(): (tty/ttyUSB0): outstanding support task prevents export of /sys/devices/pci0000:00/0000:00:1a.1/usb4/4-1 modem-manager[17535]: [1375610977.165070] [mm-manager.c:298] check_export_modem(): (tty/ttyUSB0): outstanding support task prevents export of /sys/devices/pci0000:00/0000:00:1a.1/usb4/4-1 modem-manager[17535]: [1375610977.744106] [mm-at-serial-port.c:334] debug_log(): (ttyUSB1): --> 'AT+GCAP' modem-manager[17535]: [1375610980.745081] [mm-at-serial-port.c:334] debug_log(): (ttyUSB0): --> 'AT+GCAP' modem-manager[17535]: [1375610981.449488] [mm-at-serial-port.c:334] debug_log(): (ttyUSB0): <-- 'OK' modem-manager[17535]: [1375610981.743377] [mm-at-serial-port.c:334] debug_log(): (ttyUSB1): --> 'AT+GCAP' modem-manager[17535]: [1375610984.745802] [mm-at-serial-port.c:334] debug_log(): (ttyUSB0): --> 'AT+GCAP' modem-manager[17535]: [1375610985.451757] [mm-at-serial-port.c:334] debug_log(): (ttyUSB0): <-- 'OK' modem-manager[17535]: [1375610985.743916] [mm-serial-port.c:908] mm_serial_port_close(): (ttyUSB1) device open count is 0 (close) modem-manager[17535]: [1375610985.744063] [mm-serial-port.c:923] mm_serial_port_close(): (ttyUSB1) closing serial port... modem-manager[17535]: [1375610985.750535] [mm-serial-port.c:944] mm_serial_port_close(): (ttyUSB1) serial port closed modem-manager[17535]: [1375610985.750963] [mm-serial-port.c:805] mm_serial_port_open(): (ttyUSB1) opening serial port... modem-manager[17535]: [1375610985.754647] [mm-serial-port.c:874] mm_serial_port_open(): (ttyUSB1) device open count is 1 (open) modem-manager[17535]: [1375610985.754923] [mm-qcdm-serial-port.c:196] debug_log(): (ttyUSB1): --> 7e 00 78 f0 7e modem-manager[17535]: [1375610988.746188] [mm-serial-port.c:908] mm_serial_port_close(): (ttyUSB0) device open count is 0 (close) modem-manager[17535]: [1375610988.746336] [mm-serial-port.c:923] mm_serial_port_close(): (ttyUSB0) closing serial port... modem-manager[17535]: [1375610988.746431] [mm-serial-port.c:944] mm_serial_port_close(): (ttyUSB0) serial port closed modem-manager[17535]: [1375610988.746588] [mm-serial-port.c:805] mm_serial_port_open(): (ttyUSB0) opening serial port... modem-manager[17535]: [1375610988.749474] [mm-serial-port.c:874] mm_serial_port_open(): (ttyUSB0) device open count is 1 (open) modem-manager[17535]: [1375610988.749573] [mm-qcdm-serial-port.c:196] debug_log(): (ttyUSB1): --> 7e 00 78 f0 7e modem-manager[17535]: [1375610988.749768] [mm-qcdm-serial-port.c:196] debug_log(): (ttyUSB0): --> 7e 00 78 f0 7e modem-manager[17535]: [1375610991.745794] [mm-serial-port.c:908] mm_serial_port_close(): (ttyUSB1) device open count is 0 (close) modem-manager[17535]: [1375610991.745844] [mm-serial-port.c:923] mm_serial_port_close(): (ttyUSB1) closing serial port... modem-manager[17535]: [1375610991.752479] [mm-serial-port.c:944] mm_serial_port_close(): (ttyUSB1) serial port closed modem-manager[17535]: [1375610991.752566] [mm-manager.c:690] supports_callback(): (tty/ttyUSB1): ignoring port unsupported by physical modem's plugin modem-manager[17535]: [1375610991.752630] [mm-manager.c:298] check_export_modem(): (tty/ttyUSB0): outstanding support task prevents export of /sys/devices/pci0000:00/0000:00:1a.1/usb4/4-1 modem-manager[17535]: [1375610991.752682] [mm-qcdm-serial-port.c:196] debug_log(): (ttyUSB0): --> 7e 00 78 f0 7e modem-manager[17535]: [1375610994.746416] [mm-serial-port.c:908] mm_serial_port_close(): (ttyUSB0) device open count is 0 (close) modem-manager[17535]: [1375610994.746509] [mm-serial-port.c:923] mm_serial_port_close(): (ttyUSB0) closing serial port... modem-manager[17535]: [1375610994.746584] [mm-serial-port.c:944] mm_serial_port_close(): (ttyUSB0) serial port closed modem-manager[17535]: [1375610994.747221] [mm-manager.c:714] supports_callback(): (tty/ttyUSB0): plugin 0x1594a40 (Iridium) existing 0x1594400 (Sierra) info->best 0x1594400 (Sierra) ** ERROR:mm-manager.c:715:supports_callback: code should not be reached