我通过蓝牙和 Nokia C7 手机连接到移动互联网。当手机刚启动时，蓝牙连接成功（即我在 nm-applet 中单击连接，正确设置，然后连接），但如果不成功，我在 dmesg 中收到以下信息：
Dec 28 21:28:16 falx NetworkManager[1031]: <info> Activation (94:20:53:D9:C8:C8) starting connection 'Vodafone Predefinito'
Dec 28 21:28:16 falx NetworkManager[1031]: <info> (94:20:53:D9:C8:C8): device state change: disconnected -> prepare (reason 'none') [30 40 0]
Dec 28 21:28:16 falx NetworkManager[1031]: <info> Activation (94:20:53:D9:C8:C8) Stage 1 of 5 (Device Prepare) scheduled...
Dec 28 21:28:16 falx NetworkManager[1031]: <info> Activation (94:20:53:D9:C8:C8) Stage 1 of 5 (Device Prepare) started...
Dec 28 21:28:16 falx NetworkManager[1031]: <info> Activation (94:20:53:D9:C8:C8) Stage 2 of 5 (Device Configure) scheduled...
Dec 28 21:28:16 falx NetworkManager[1031]: <info> Activation (94:20:53:D9:C8:C8) Stage 1 of 5 (Device Prepare) complete.
Dec 28 21:28:16 falx NetworkManager[1031]: <info> Activation (94:20:53:D9:C8:C8) Stage 2 of 5 (Device Configure) starting...
Dec 28 21:28:16 falx NetworkManager[1031]: <info> (94:20:53:D9:C8:C8): device state change: prepare -> config (reason 'none') [40 50 0]
Dec 28 21:28:16 falx NetworkManager[1031]: <info> Activation (94:20:53:D9:C8:C8) Stage 2 of 5 (Device Configure) complete.
Dec 28 21:28:20 falx NetworkManager[1031]: <info> Activation (94:20:53:D9:C8:C8 94:20:53:D9:C8:C8/bluetooth) Stage 2 of 5 (Device Configure) successful. Will connect via DUN.
Dec 28 21:28:20 falx NetworkManager[1031]: <info> Activation (94:20:53:D9:C8:C8/bluetooth) Stage 2 of 5 (Device Configure) waiting for modem to appear.
Dec 28 21:28:20 falx modem-manager[998]: <info> (rfcomm0) opening serial port...
Dec 28 21:28:20 falx kernel: [23928.016873] rfcomm_tty_ioctl: TIOCGSERIAL is not supported
Dec 28 21:28:21 falx modem-manager[998]: <info> (rfcomm0) closing serial port...
Dec 28 21:28:21 falx modem-manager[998]: <info> (rfcomm0) serial port closed
Dec 28 21:28:21 falx modem-manager[998]: <info> (rfcomm0) opening serial port...
Dec 28 21:28:21 falx modem-manager[998]: <info> (Generic): GSM modem /sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.4 claimed port rfcomm0
Dec 28 21:28:21 falx kernel: [23928.827280] rfcomm_tty_ioctl: TIOCGSERIAL is not supported
Dec 28 21:28:21 falx modem-manager[998]: <info> (rfcomm0) closing serial port...
Dec 28 21:28:21 falx modem-manager[998]: <info> (rfcomm0) serial port closed
Dec 28 21:28:21 falx NetworkManager[1031]: <info> Activation (94:20:53:D9:C8:C8/bluetooth) Stage 2 of 5 (Device Configure) modem found.
Dec 28 21:28:21 falx modem-manager[998]: <info> (rfcomm0) opening serial port...
Dec 28 21:28:21 falx modem-manager[998]: <info> Modem /org/freedesktop/ModemManager/Modems/5: state changed (disabled -> enabling)
Dec 28 21:28:21 falx kernel: [23929.158953] rfcomm_tty_ioctl: TIOCGSERIAL is not supported
Dec 28 21:28:22 falx modem-manager[998]: <info> Modem /org/freedesktop/ModemManager/Modems/5: state changed (enabling -> enabled)
Dec 28 21:28:22 falx modem-manager[998]: <info> Modem /org/freedesktop/ModemManager/Modems/5: state changed (enabled -> registered)
Dec 28 21:28:22 falx NetworkManager[1031]: <warn> GSM connection failed: (32) Unknown registration status response
Dec 28 21:28:22 falx NetworkManager[1031]: <info> (94:20:53:D9:C8:C8): device state change: config -> failed (reason 'unknown') [50 120 1]
Dec 28 21:28:22 falx NetworkManager[1031]: <info> Marking connection 'Vodafone Predefinito' invalid.
Dec 28 21:28:22 falx NetworkManager[1031]: <warn> Activation (94:20:53:D9:C8:C8) failed.
Dec 28 21:28:22 falx NetworkManager[1031]: <info> (94:20:53:D9:C8:C8): device state change: failed -> disconnected (reason 'none') [120 30 0]
Dec 28 21:28:22 falx NetworkManager[1031]: <info> (94:20:53:D9:C8:C8): deactivating device (reason 'none') [0]
Dec 28 21:28:22 falx NetworkManager[1031]: nm_system_iface_flush_routes: assertion `ifindex > 0' failed
Dec 28 21:28:22 falx NetworkManager[1031]: nm_system_iface_flush_addresses: assertion `ifindex > 0' failed
Dec 28 21:28:22 falx modem-manager[998]: <info> (rfcomm0) closing serial port...
Dec 28 21:28:22 falx modem-manager[998]: <info> (rfcomm0) serial port closed
Dec 28 21:28:22 falx modem-manager[998]: <info> (tty/rfcomm0): released by modem /sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.4
Dec 28 21:28:22 falx modem-manager[998]: <info> Modem /org/freedesktop/ModemManager/Modems/5: state changed (registered -> disabled)
Dec 28 21:28:22 falx modem-manager[998]: mm_generic_gsm_update_signal_quality: assertion `self != NULL' failed
重启手机后，连接就正常了。我使用其他供应商（奥地利的 Orange）时也遇到了同样的问题，使用同一供应商（沃达丰）的其他手机时则没有遇到任何问题。
我没有发现任何提到此类问题的 C7 帖子，因此我认为它在 Windows 下运行良好。有什么提示吗？
（我正在运行最新的 Ubuntu 11.10）
答案1
被发现是modemmanager解析手机响应的问题，参见gnome 错误 #667869或者启动板错误 #916038。