I can properly disconnect and reconnect via NM normally. This only happens
when I am connected, then lose GPRS connectivity as I'm moving (I get the
OSD indicating that network connectivity has been lost). At that point I am
unable to reconnect (even though I have GPRS coverage again). Disconnecting
and reconnecting the device has no effect. And the system hang on suspend
only happens after this GPRS disconnect.

I use my netbook on the train while travelling each morning which is when I
have this problem. I must admit I haven't tried for a few days since the
problem got annoying enough that I went back to my Jaunty install (which
works perfectly so this is definitely a Karmic regression). I'll aim to give
it a try again this week and report back.
Simon

2009/10/12 Alexander Sack <email address hidden>

> Emmanuel ... you have a different hardware, please don't make this bug a
> catch-all thing that cannot be handled :).
>
> Simon, so does it make a difference whether you properly disconnect
> through NM before reconnect? Did you replug the device in between?
>
> Can you try to reproduce your issue a few times and observe if you get
> different kernel dumps in syslog at some point?
>
> ** Changed in: network-manager (Ubuntu)
>       Status: New => Invalid
>
> ** Changed in: modemmanager (Ubuntu)
>       Status: New => Incomplete
>
> --
> [karmic] Network-manager fails to reconnect to 3G network
> https://bugs.launchpad.net/bugs/438150
> You received this bug notification because you are a direct subscriber
> of the bug.
>
> Status in “modemmanager” package in Ubuntu: Incomplete
> Status in “network-manager” package in Ubuntu: Invalid
>
> Bug description:
> Binary package hint: network-manager
>
> Running latest Karmic updates (but this has been happening since I first
> tested with alpha 6).
>
> First connection to the network on my 3G USB modem works perfectly.
> However, if I lose connection (if I'm moving and roam outside cell coverage)
> then I lose connection but when I come back into coverage (blue blinking
> light on modem indicates coverage) I am unable to reconnect. Each time I
> select the network from the nm-applet I just get the OSD notify that the GSM
> network disconnected. Unplugging and re-plugging in my modem does not help.
> The only way to successfully connect is by rebooting my laptop. Syslog shows
> the following:
>
> Sep 28 07:36:24 spitfire-karmic NetworkManager: <info>  (ttyUSB0): device
> state change: 8 -> 9 (reason 13)
> Sep 28 07:36:24 spitfire-karmic NetworkManager: <info>  Activation
> (ttyUSB0) failed.
> Sep 28 07:36:24 spitfire-karmic NetworkManager: <info>  (ttyUSB0): device
> state change: 9 -> 3 (reason 0)
> Sep 28 07:36:24 spitfire-karmic NetworkManager: <info>  (ttyUSB0):
> deactivating device (reason: 0).
> Sep 28 07:36:24 spitfire-karmic modem-manager: (ttyUSB0) closing serial
> device...
> Sep 28 07:36:24 spitfire-karmic NetworkManager: <WARN>  monitor_cb(): Could
> not read ppp stats: No such device
> Sep 28 07:36:24 spitfire-karmic NetworkManager: flush_routes: assertion
> `iface_idx >= 0' failed
> Sep 28 07:36:24 spitfire-karmic NetworkManager: flush_addresses: assertion
> `iface_idx >= 0' failed
> Sep 28 07:36:24 spitfire-karmic NetworkManager:    SCPlugin-Ifupdown:
> devices removed (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
> Sep 28 07:36:26 spitfire-karmic NetworkManager: <debug> [1254119786.002657]
> ensure_killed(): waiting for ppp pid 5661 to exit
> Sep 28 07:36:26 spitfire-karmic NetworkManager: <debug> [1254119786.002994]
> ensure_killed(): ppp pid 5661 cleaned up
> Sep 28 07:37:56 spitfire-karmic NetworkManager: <info>  Activation
> (ttyUSB0) starting connection '3 Internet'
> Sep 28 07:37:56 spitfire-karmic NetworkManager: <info>  (ttyUSB0): device
> state change: 3 -> 4 (reason 0)
> Sep 28 07:37:56 spitfire-karmic NetworkManager: <info>  Activation
> (ttyUSB0) Stage 1 of 5 (Device Prepare) scheduled...
> Sep 28 07:37:56 spitfire-karmic NetworkManager: <info>  Activation
> (ttyUSB0) Stage 1 of 5 (Device Prepare) started...
> Sep 28 07:37:56 spitfire-karmic NetworkManager: <info>  Activation
> (ttyUSB0) Stage 1 of 5 (Device Prepare) complete.
> Sep 28 07:37:56 spitfire-karmic modem-manager: (ttyUSB0) opening serial
> device...
> Sep 28 07:37:56 spitfire-karmic NetworkManager: <WARN>
>  stage1_prepare_done(): GSM modem connection failed: Could not open serial
> device ttyUSB0: No such device
> Sep 28 07:37:56 spitfire-karmic NetworkManager: <info>  (ttyUSB0): device
> state change: 4 -> 9 (reason 1)
> Sep 28 07:37:56 spitfire-karmic NetworkManager: <info>  Marking connection
> '3 Internet' invalid.
> Sep 28 07:37:56 spitfire-karmic NetworkManager: Tried to set deprecated
> property gsm/puk
>
> ProblemType: Bug
> Architecture: i386
> CRDA: Error: [Errno 2] No such file or directory
> Date: Mon Sep 28 14:37:31 2009
> DistroRelease: Ubuntu 9.10
> IfupdownConfig:
>  auto lo
>  iface lo inet loopback
> IpRoute:
>  10.64.64.64 dev ppp0  proto kernel  scope link  src 92.40.27.251
>  169.254.0.0/16 dev ppp0  scope link  metric 1000
>  default via 10.64.64.64 dev ppp0  proto static
> Package: network-manager 0.8~a~git.20090923t064445.b20cef2-0ubuntu1
> ProcEnviron:
>  LANG=en_GB.UTF-8
>  SHELL=/bin/bash
> ProcVersionSignature: Ubuntu 2.6.31-11.36-generic
> SourcePackage: network-manager
> Uname: Linux 2.6.31-11-generic i686
>