Public bug reported:

When using Xubuntu 12.04 on battery power, i have just realised that I
cannot connect to the mobile internet.

Expected behaviour:  plug in (Nokia) mobile phone -- select 'pc suite'
as connection type.  Click network manager in task-bar.  Select mobile
broadband connection.  Connect to internet.

Observed behaviour:  plug in (Nokia) mobile phone -- select 'pc suite'
as connection type.  Click network manager in task-bar.  See that not
mobile network is available.  Do not connect to internet(!)


Requested details follow.

$ lsb_release -rd
Description:    Ubuntu 12.04 LTS
Release:        12.04

$ apt-cache policy network-manager
network-manager:
  Installed: 0.9.4.0-0ubuntu4
  Candidate: 0.9.4.0-0ubuntu4
  Version table:
 *** 0.9.4.0-0ubuntu4 0
        500 http://gb.archive.ubuntu.com/ubuntu/ precise-updates/main amd64 
Packages
        100 /var/lib/dpkg/status
     0.9.4.0-0ubuntu3 0
        500 http://gb.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: network-manager 0.9.4.0-0ubuntu4
ProcVersionSignature: Ubuntu 3.2.0-24.39-generic 3.2.16
Uname: Linux 3.2.0-24-generic x86_64
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
Date: Sun May 27 17:00:41 2012
IfupdownConfig:
 auto lo
 iface lo inet loopback
InstallationMedia: Xubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
IpRoute:
 default via 10.6.6.6 dev ppp0  proto static 
 10.6.6.6 dev ppp0  proto kernel  scope link  src 10.165.201.200 
 169.254.0.0/16 dev ppp0  scope link  metric 1000
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
 WimaxEnabled=true
ProcEnviron:
 LANGUAGE=en_GB:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: network-manager
UpgradeStatus: Upgraded to precise on 2012-05-04 (23 days ago)
nmcli-con:
 NAME                      UUID                                   TYPE          
    TIMESTAMP    TIMESTAMP-REAL                     AUTOCONNECT   READONLY   
DBUS-PATH                                 
 Wired connection 1        93fd1be1-2e0d-4d12-abe8-ddb42ecbd457   
802-3-ethernet    1338113409   Sun 27 May 2012 11:10:09 BST       no            
no         /org/freedesktop/NetworkManager/Settings/2
 eduroam                   a3128d87-f057-4d70-8abf-9392a4049ca1   
802-11-wireless   1330424231   Tue 28 Feb 2012 10:17:11 GMT       no            
no         /org/freedesktop/NetworkManager/Settings/1
 T-Mobile Default          e2e62a31-ada0-4564-b4c7-dd53e3d92964   gsm           
    1338134318   Sun 27 May 2012 16:58:38 BST       no            no         
/org/freedesktop/NetworkManager/Settings/0
 lancaster                 a8b96bc0-181f-4934-8970-6ea88204622c   
802-11-wireless   0            never                              yes           
no         /org/freedesktop/NetworkManager/Settings/3
nmcli-dev:
 DEVICE     TYPE              STATE         DBUS-PATH                           
       
 ttyACM0    gsm               connected     
/org/freedesktop/NetworkManager/Devices/2  
 wlan0      802-11-wireless   unavailable   
/org/freedesktop/NetworkManager/Devices/1  
 eth0       802-3-ethernet    unavailable   
/org/freedesktop/NetworkManager/Devices/0
nmcli-nm:
 RUNNING         VERSION    STATE           NET-ENABLED   WIFI-HARDWARE   WIFI  
     WWAN-HARDWARE   WWAN      
 running         0.9.4.0    connected       enabled       disabled        
disabled   enabled         enabled

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

** Affects: network-manager (Ubuntu)
     Importance: Undecided
         Status: Fix Released


** Tags: amd64 apport-bug precise

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https://bugs.launchpad.net/bugs/1005207

Title:
  network manager doesn't see mobile networks on battery power

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