[Bug 413989] [NEW] Connecting through huawei gsm-usb-modem not working (stops after Stage 4)

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On a laptop running Ubuntu Karmic (all updates installed as of today) 
NetworkManager fails to establish an internet connection using a
Huawei 160 (reported by `lsusb` as E220/270) USB/HDSPA modem.
(The same works fine under Jaunty)

Steps to reproduce:

1. Plug in the huawei usb stick and follow the network manager setup steps
 selecting Germany / FONIC as provider and enter PIN number. Other
 settings remain as-is - login and password remain empty.

2. Select connect in the network-manager applett

3. After some time the usb-stick will indicate through constant blue
   LED that a connection has successfully been established however
   the network manager does not report establishment of a connection.
   The applet icon is still animating indicating a "connecting.." state.

Details:

Nothing changes after step 3 until I cancel the connection. Looking at the
output of /var/log/messages and /var/log/daemon.log it appears that 
network manager only gets to Stage 4 but Stage 5 (Committing IPv4 Config) 
never actually starts nor does the log display its scheduling. 

If I specify some random username and password network manager will segfault.
No further details on this right now

** Affects: modemmanager
     Importance: Undecided
         Status: New

** Affects: network-manager
     Importance: Undecided
         Status: New

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: gsm huawei modem
-- 
 Connecting through huawei gsm-usb-modem not working (stops after Stage 4)
https://bugs.launchpad.net/bugs/413989
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