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I have a Sierra MC8755 datacard, which came with Fujitsu Amilo Pro v3525. The card works perfectly under XP, but not under Linux. The ttyUSB0 - ttyUSB2 devices are created, when "sierra" driver gets loaded. NetworkManager does not see the device. Tried to contact the ttyUSB ports with putty, no success. All current updates installed, the same for datacard firmware and laptop's bios.

EDIT:

I was just bluetooth-pairing my Nokia phone with this laptop, and suddenly the Sierra card got recognised. I do not know, if the pairing had anything to do with this.. Quite unlikely. Looks like my phone got recognised as a mobile broadband device and the system found my Sierra card. Of course, this might also be due to system updates.

Next prob.. I created the connection setup with NetworkManager. When I try to connect, all I get is a notification that I'm offline. And the following to /var/log/syslog:

Feb 18 19:04:32 jki-laptop NetworkManager[11489]:  Activation (ttyUSB0) starting connection 'Sonera Default'
Feb 18 19:04:32 jki-laptop NetworkManager[11489]:  (ttyUSB0): device state change: disconnected -> prepare (reason 'none') [30 40 0]
Feb 18 19:04:32 jki-laptop NetworkManager[11489]:  Activation (ttyUSB0) Stage 1 of 5 (Device Prepare) scheduled...
Feb 18 19:04:32 jki-laptop NetworkManager[11489]:  Activation (ttyUSB0) Stage 1 of 5 (Device Prepare) started...
Feb 18 19:04:32 jki-laptop NetworkManager[11489]:  Activation (ttyUSB0) Stage 1 of 5 (Device Prepare) complete.
Feb 18 19:04:32 jki-laptop modem-manager[4863]:   (ttyUSB0) opening serial port...
Feb 18 19:04:32 jki-laptop modem-manager[4863]:   (ttyUSB0): port attributes not fully set
Feb 18 19:04:32 jki-laptop modem-manager[4863]:   Modem /org/freedesktop/ModemManager/Modems/0: state changed (disabled -> enabling)
Feb 18 19:04:32 jki-laptop modem-manager[4863]:   (ttyUSB2) opening serial port...
Feb 18 19:04:32 jki-laptop modem-manager[4863]:   (ttyUSB2): port attributes not fully set
Feb 18 19:04:32 jki-laptop modem-manager[4863]:   (ttyUSB0): failed to query SMS mode, assuming text mode
Feb 18 19:04:32 jki-laptop modem-manager[4863]:   (ttyUSB0): failed to enable USSD notifications.
Feb 18 19:04:32 jki-laptop modem-manager[4863]:   Modem /org/freedesktop/ModemManager/Modems/0: state changed (enabling -> disabled)
Feb 18 19:04:32 jki-laptop modem-manager[4863]:   (ttyUSB0) closing serial port...
Feb 18 19:04:32 jki-laptop modem-manager[4863]:   (ttyUSB0) serial port closed
Feb 18 19:04:32 jki-laptop modem-manager[4863]: mm_serial_port_close: assertion `priv->open_count > 0' failed
Feb 18 19:04:32  modem-manager[4863]: last message repeated 5 times
Feb 18 19:04:32 jki-laptop modem-manager[4863]:   (ttyUSB2) closing serial port...
Feb 18 19:04:32 jki-laptop modem-manager[4863]:   (ttyUSB2) serial port closed
Feb 18 19:04:32 jki-laptop NetworkManager[11489]:  GSM modem enable failed: (32) Failed to find a usable modem character set
Feb 18 19:04:32 jki-laptop NetworkManager[11489]:  (ttyUSB0): device state change: prepare -> failed (reason 'modem-init-failed') [40 120 28]
Feb 18 19:04:32 jki-laptop NetworkManager[11489]:  Marking connection 'Sonera Default' invalid.
Feb 18 19:04:32 jki-laptop NetworkManager[11489]:  Activation (ttyUSB0) failed for connection 'Sonera Default'
Feb 18 19:04:32 jki-laptop NetworkManager[11489]:  (ttyUSB0): device state change: failed -> disconnected (reason 'none') [120 30 0]
Feb 18 19:04:32 jki-laptop NetworkManager[11489]:  (ttyUSB0): deactivating device (reason 'none') [0]

Next, I'm going to dig into those AT commands. But if anyone happens to have a ready solution, I'd really appreciate it.

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