Comment 25 for bug 455031

While I try to use an integrated Huawei E620 modem, the problem is basically the same as tracked by this bug. Adding this PPA, upgrading and rebooting: still does not work. Please find syslog entries enclosed below:

Nov 8 15:23:47 eee901go NetworkManager: <info> Activation (ttyUSB0) starting connection 'XXX'
Nov 8 15:23:47 eee901go NetworkManager: <info> (ttyUSB0): device state change: 3 -> 4 (reason 0)
Nov 8 15:23:47 eee901go NetworkManager: <info> Activation (ttyUSB0) Stage 1 of 5 (Device Prepare) scheduled...
Nov 8 15:23:47 eee901go NetworkManager: <info> Activation (ttyUSB0) Stage 1 of 5 (Device Prepare) started...
Nov 8 15:23:47 eee901go NetworkManager: <info> Activation (ttyUSB0) Stage 1 of 5 (Device Prepare) complete.
Nov 8 15:23:47 eee901go modem-manager: (ttyUSB0) opening serial device...
Nov 8 15:23:48 eee901go modem-manager: Registration state changed: 1
Nov 8 15:23:48 eee901go modem-manager: Got failure code 100: Unknown error
Nov 8 15:23:48 eee901go NetworkManager: <WARN> stage1_prepare_done(): GSM modem connection failed: No cause information available
Nov 8 15:23:48 eee901go NetworkManager: <info> (ttyUSB0): device state change: 4 -> 9 (reason 1)
Nov 8 15:23:48 eee901go NetworkManager: <info> Marking connection 'Fonic' invalid.
Nov 8 15:23:48 eee901go NetworkManager: <info> Activation (ttyUSB0) failed.
Nov 8 15:23:48 eee901go NetworkManager: <info> (ttyUSB0): device state change: 9 -> 3 (reason 0)
Nov 8 15:23:48 eee901go NetworkManager: <info> (ttyUSB0): deactivating device (reason: 0).
Nov 8 15:23:48 eee901go NetworkManager: flush_routes: assertion `iface_idx >= 0' failed
Nov 8 15:23:48 eee901go NetworkManager: flush_addresses: assertion `iface_idx >= 0' failed
Nov 8 15:23:48 eee901go modem-manager: (ttyUSB0) closing serial device...