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[Launchpad Bug Tracker <1426122@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package network-manager - 0.9.10.0-4ubuntu7

---------------
network-manager (0.9.10.0-4ubuntu7) vivid; urgency=medium

  [ Tony Espy ]
  * touch: include the MTK specific modems in the ignore list
    (LP: #1426122)
 -- Ricardo Salveti de Araujo <ricardo.salveti@xxxxxxxxxxxxx>   Fri, 27 Feb 2015 18:50:35 -0300

** Changed in: network-manager (Ubuntu)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1426122

Title:
  Problems switching between WiFi and Mobile Data on MTK-based phones

Status in network-manager package in Ubuntu:
  Fix Released

Bug description:
  On recent vivid  images running on phones with MTK modems ( arale,
  krillin ) switching between WiFi and mobile-data and back leads to
  broken networking where neither device ( WiFi or WWAN ) will establish
  a network connection.

  It appears that the new version of network-manager in vivid (
  0.9.10-4ubuntu6 ) is incorrectly attempting to manage the devices
  created by rild when mobile-data connections are established.

  For instance, on krillin running RTM, 'nmcli -d' reports the following
  networking devices:

  % nmcli d
  wlan0          wifi        disconnected
  ril_0             gsm        connected
  ril_1             gsm        disconnected

  On the same device running vivid, an extra device which should be
  unmanaged is listed:

  % nmcli d
  ril_0        gsm       connected     /310410786147829/context2
  ccmni0   wifi       connected     ccmni0                    
  wlan0     wifi       disconnected  --                        
  ril_1        gsm       unavailable   --
  ccmni1  wifi        unmanaged

  Note that ccmni0 is listed as a wifi device, with a status of
  connected whereas ccmni1 is listed as unmanaged.

  If you look at syslog, you'll see a two log messages output after
  ril_0 is activated which show network-manager detecting a change in
  ccmni0 and deciding it should become managed:

  This bug was discovered on ubuntu-touch/vivid-proposed #122.

  
  Feb 25 21:17:08 ubuntu-phablet NetworkManager[1163]: <info> (ccmni0): device state change: unmanaged -> unavailable (reason 'connection-assumed') [10 20\
   41]
  Feb 25 21:17:08 ubuntu-phablet NetworkManager[1163]: <info> (ccmni0): device state change: unavailable -> disconnected (reason 'connection-assumed') [20\
   30 41]

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