I'm resending this because I'm not sure whether it reached somebody or not...
Hello, > This is most likely a modemmanager issue. Your correct ! Starting it (with networkmanagerstopped) was enough to crash my braille display. According to the attached log modemmanager indeed tries to look fora modem on /dev/ttyUSB0, which is the device corresponding to the USB to serial adapter used to connect the braille display to the computer. Thanks ! Sébastien.
modem-manager[2718]: <info> [1302375980.120857] [main.c:167] main(): ModemManager (version 0.4) starting... modem-manager[2718]: <info> [1302375980.199000] [mm-manager.c:116] load_plugin(): Loaded plugin X22X modem-manager[2718]: <info> [1302375980.205557] [mm-manager.c:116] load_plugin(): Loaded plugin Nokia modem-manager[2718]: <info> [1302375980.207080] [mm-manager.c:116] load_plugin(): Loaded plugin Linktop modem-manager[2718]: <info> [1302375980.207988] [mm-manager.c:116] load_plugin(): Loaded plugin Novatel modem-manager[2718]: <info> [1302375980.210565] [mm-manager.c:116] load_plugin(): Loaded plugin Option High-Speed modem-manager[2718]: <info> [1302375980.211754] [mm-manager.c:116] load_plugin(): Loaded plugin Sierra modem-manager[2718]: <info> [1302375980.220287] [mm-manager.c:116] load_plugin(): Loaded plugin Gobi modem-manager[2718]: <info> [1302375980.222901] [mm-manager.c:116] load_plugin(): Loaded plugin Longcheer modem-manager[2718]: <info> [1302375980.223744] [mm-manager.c:116] load_plugin(): Loaded plugin Generic modem-manager[2718]: <info> [1302375980.224689] [mm-manager.c:116] load_plugin(): Loaded plugin Huawei modem-manager[2718]: <info> [1302375980.226173] [mm-manager.c:116] load_plugin(): Loaded plugin SimTech modem-manager[2718]: <info> [1302375980.227109] [mm-manager.c:116] load_plugin(): Loaded plugin ZTE modem-manager[2718]: <info> [1302375980.228082] [mm-manager.c:116] load_plugin(): Loaded plugin Option modem-manager[2718]: <info> [1302375980.228868] [mm-manager.c:116] load_plugin(): Loaded plugin AnyData modem-manager[2718]: <info> [1302375980.229626] [mm-manager.c:116] load_plugin(): Loaded plugin MotoC modem-manager[2718]: <info> [1302375980.230942] [mm-manager.c:116] load_plugin(): Loaded plugin Ericsson MBM modem-manager[2718]: <debug> [1302375980.242437] [mm-manager.c:802] device_added(): (tty/ttyS0): port's parent platform driver is not whitelisted modem-manager[2718]: <debug> [1302375980.242604] [mm-manager.c:802] device_added(): (tty/ttyS1): port's parent platform driver is not whitelisted modem-manager[2718]: <debug> [1302375980.242751] [mm-manager.c:802] device_added(): (tty/ttyS2): port's parent platform driver is not whitelisted modem-manager[2718]: <debug> [1302375980.242884] [mm-manager.c:802] device_added(): (tty/ttyS3): port's parent platform driver is not whitelisted modem-manager[2718]: <info> [1302375980.248315] [mm-serial-port.c:702] mm_serial_port_open(): (ttyUSB0) opening serial port... modem-manager[2718]: <debug> [1302375980.252899] [mm-serial-port.c:764] mm_serial_port_open(): (ttyUSB0) device open count is 1 (open) modem-manager[2718]: <debug> [1302375980.252941] [mm-plugin-base.c:813] try_open(): (ttyUSB0): probe requested by plugin 'Generic' modem-manager[2718]: <debug> [1302375980.292614] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\6' modem-manager[2718]: <debug> [1302375980.363244] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): --> 'AT+GCAP<CR>' modem-manager[2718]: <debug> [1302375982.488801] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\1C\0\16\1\4' modem-manager[2718]: <debug> [1302375982.584790] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\1C\0\0\4' modem-manager[2718]: <debug> [1302375982.856784] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\1C\16\1\0\4' modem-manager[2718]: <debug> [1302375982.908684] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\1C\0\0\4' modem-manager[2718]: <debug> [1302375983.136702] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\1C\0\16\1\4' modem-manager[2718]: <debug> [1302375983.232704] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\1C\0\0\4' modem-manager[2718]: <debug> [1302375983.328758] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\1C\16\1\0\4' modem-manager[2718]: <debug> [1302375983.420787] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\1C\0\0\4' modem-manager[2718]: <debug> [1302375983.472777] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\1C\0\16\1\4' modem-manager[2718]: <debug> [1302375983.568821] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\1C\0\0\4' modem-manager[2718]: <debug> [1302375983.620688] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\1C\16\1\0\4' modem-manager[2718]: <debug> [1302375983.672816] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\1C\0\0\4' modem-manager[2718]: <debug> [1302375983.724816] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\1C\0\16\1\4' modem-manager[2718]: <debug> [1302375983.820827] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\1C\0\0\4' modem-manager[2718]: <debug> [1302375983.872807] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\1C\16\1\0\4' modem-manager[2718]: <debug> [1302375983.924824] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\1C\0\0\4' modem-manager[2718]: <debug> [1302375983.976811] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\1C\0\16\1\4' modem-manager[2718]: <debug> [1302375984.028798] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\1' modem-manager[2718]: <debug> [1302375984.029104] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- 'C\0\0\4' modem-manager[2718]: <debug> [1302375984.080818] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\1C\16\1\0\4' modem-manager[2718]: <debug> [1302375984.132671] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\1' modem-manager[2718]: <debug> [1302375984.132931] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- 'C\0\0\4' modem-manager[2718]: <debug> [1302375984.228783] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\1' modem-manager[2718]: <debug> [1302375984.229134] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- 'C\0\16\1\4' modem-manager[2718]: <debug> [1302375984.324777] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\1' modem-manager[2718]: <debug> [1302375984.325086] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- 'C\16\1\0\4' modem-manager[2718]: <debug> [1302375984.376769] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\1' modem-manager[2718]: <debug> [1302375984.377242] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- 'C\0\0\4' modem-manager[2718]: <debug> [1302375984.754130] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): --> 'AT+GCAP<CR>' modem-manager[2718]: <debug> [1302375985.588787] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\1C\0\0\4' modem-manager[2718]: <debug> [1302375985.640789] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\6' modem-manager[2718]: <debug> [1302375985.648773] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\1C\0\16\1\4' modem-manager[2718]: <debug> [1302375985.700780] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\1C\0\0\4' modem-manager[2718]: <debug> [1302375985.752787] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\1C\16\1\0\4' modem-manager[2718]: <debug> [1302375985.804788] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\1C\0\0\4' modem-manager[2718]: <debug> [1302375985.856796] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\1C\0\16\1\4' modem-manager[2718]: <debug> [1302375985.952798] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\1C\0\0\4' modem-manager[2718]: <debug> [1302375986.004783] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\1C\16\1\0\4' modem-manager[2718]: <debug> [1302375986.056780] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\1C\0\0\4' modem-manager[2718]: <debug> [1302375986.632788] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\1C\0\16\1\4' modem-manager[2718]: <debug> [1302375986.772779] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\1C\0\0\4' modem-manager[2718]: <debug> [1302375988.755300] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): --> 'AT+GCAP<CR>' modem-manager[2718]: <debug> [1302375991.036685] [mm-at-serial-port.c:298] debug_log(): (ttyUSB0): <-- '\6' modem-manager[2718]: <debug> [1302375992.754880] [mm-serial-port.c:798] mm_serial_port_close(): (ttyUSB0) device open count is 0 (close) modem-manager[2718]: <info> [1302375992.755025] [mm-serial-port.c:811] mm_serial_port_close(): (ttyUSB0) closing serial port... modem-manager[2718]: <info> [1302375992.755149] [mm-serial-port.c:834] mm_serial_port_close(): (ttyUSB0) serial port closed modem-manager[2718]: <info> [1302375992.755508] [mm-serial-port.c:702] mm_serial_port_open(): (ttyUSB0) opening serial port... modem-manager[2718]: <debug> [1302375992.760743] [mm-serial-port.c:764] mm_serial_port_open(): (ttyUSB0) device open count is 1 (open) modem-manager[2718]: <debug> [1302375992.761034] [mm-qcdm-serial-port.c:194] debug_log(): (ttyUSB0): --> 00 78 f0 7e modem-manager[2718]: <debug> [1302375995.136805] [mm-qcdm-serial-port.c:194] debug_log(): (ttyUSB0): <-- 06 modem-manager[2718]: <debug> [1302375995.536791] [mm-qcdm-serial-port.c:194] debug_log(): (ttyUSB0): <-- 01 43 10 01 00 04 modem-manager[2718]: <debug> [1302375995.632798] [mm-qcdm-serial-port.c:194] debug_log(): (ttyUSB0): <-- 01 43 00 00 04 modem-manager[2718]: <debug> [1302375995.753374] [mm-qcdm-serial-port.c:194] debug_log(): (ttyUSB0): --> 00 78 f0 7e modem-manager[2718]: <debug> [1302375995.860799] [mm-qcdm-serial-port.c:194] debug_log(): (ttyUSB0): <-- 01 43 00 10 01 04 modem-manager[2718]: <debug> [1302375995.956784] [mm-qcdm-serial-port.c:194] debug_log(): (ttyUSB0): <-- 00 00 04 modem-manager[2718]: <debug> [1302375996.096793] [mm-qcdm-serial-port.c:194] debug_log(): (ttyUSB0): <-- 01 43 10 01 00 04 modem-manager[2718]: <debug> [1302375996.192712] [mm-qcdm-serial-port.c:194] debug_log(): (ttyUSB0): <-- 01 43 00 00 04 modem-manager[2718]: <debug> [1302375996.680779] [mm-qcdm-serial-port.c:194] debug_log(): (ttyUSB0): <-- 43 00 10 01 04 modem-manager[2718]: <debug> [1302375996.776786] [mm-qcdm-serial-port.c:194] debug_log(): (ttyUSB0): <-- 01 43 00 00 04 modem-manager[2718]: <debug> [1302375997.004694] [mm-qcdm-serial-port.c:194] debug_log(): (ttyUSB0): <-- 01 43 00 c0 04 modem-manager[2718]: <debug> [1302375997.056769] [mm-qcdm-serial-port.c:194] debug_log(): (ttyUSB0): <-- 01 43 00 00 04 modem-manager[2718]: <debug> [1302375998.753580] [mm-serial-port.c:798] mm_serial_port_close(): (ttyUSB0) device open count is 0 (close) modem-manager[2718]: <info> [1302375998.753708] [mm-serial-port.c:811] mm_serial_port_close(): (ttyUSB0) closing serial port... modem-manager[2718]: <info> [1302375998.753806] [mm-serial-port.c:834] mm_serial_port_close(): (ttyUSB0) serial port closed modem-manager[2718]: <info> [1302376026.561846] [main.c:41] mm_signal_handler(): Caught signal 2, shutting down...
