Public bug reported:
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]
** Affects: network-manager (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1426122
Title:
Problems switching between WiFi and Mobile Data on MTK-based phones
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