[Bug 201202] Re: WiFi roaming causes NetworkManager to lose routing

[Alexander Sack]

*** This bug is a duplicate of bug 291760 ***
    https://bugs.launchpad.net/bugs/291760

Bob. Thanks for the patch. However, NetworkManager does not do the
roaming on its own; it is a wpasupplicant/driver decision to switch/disassoc
from the AP.

The output seen (and wrongly patched out by the patch) is NM reactively
updating its internal state _after_ wpasupplicant/driver did the roaming to (none).                                                                                      
                                                                                                                                     
The reason why we see this "roaming to (none)" symptom is that some                                                                  
drivers (like atheros) are buggy when background scanning is                                                                         
used. They often disassociate temporarily and that's when we see the                                                                 
roaming to (none) in the log. We discussed this at UDS with                                                                          
linville and friends and there is work on in progress to make drivers                                                                
behave better [1].                                                                                                                   
                                                                                                                                     
Also we thought and spec'ed to remove background scanning for karmic                                                                 
[2], however with wifi consumers for geolocation (like in firefox),                                                                  
its getting even more important that background scanning is done                                                                     
regularly.                                                                                                                           
                                                                                                                                     
[1] - http://bugzilla.kernel.org/show_bug.cgi?id=12635#c7                                                                            
[2] - https://wiki.ubuntu.com/DesktopTeam/Specs/Karmic/NetworkUI

Also see bug 291760 which is about background scanning issues.


** Bug watch added: Linux Kernel Bug Tracker #12635
   http://bugzilla.kernel.org/show_bug.cgi?id=12635

** Summary changed:

- WiFi roaming causes NetworkManager to lose routing
+ background scanning causes drivers to disassociate - WiFi roaming causes NetworkManager to lose routing

** This bug has been marked a duplicate of bug 291760
   network-manager roams to (none) ((none)) - background scanning

-- 
background scanning causes drivers to disassociate - WiFi roaming causes NetworkManager to lose routing
https://bugs.launchpad.net/bugs/201202
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