I'd forgotten this bug report was here. I found that reverting this
patch fixed it for me (ath9k)

commit 98f392b085985a75274fe02ec8aa92f4ac0d8a80
Author: Dan Williams <[email protected]>
Date:   Sat Oct 11 18:32:24 2008 +0000

    2008-10-11  Dan Williams  <[email protected]>
    
        * src/nm-device-wifi.c
                - (can_scan): remove old madwifi hack for not scanning while 
connected
    

And I had mentioned it here
http://mail.gnome.org/archives/networkmanager-list/2009-January/msg00107.html
but forgot about it afterward. Then at some point I wiped out my SVN tree and 
pulled the new NM source from git, and ran into the same problem all over again.

I still believe scanning is a bad idea when you're already associated to
an AP. I would guess in the cases where you're walking around a campus
and the potential exists to roam between multiple equivalent APs, you
could have a setting that says "scan when idle" or somesuch, e.g. when
the screensaver activates. But in a lot of common cases, scanning while
connected is just a waste.

-- 
network-manager roams to (none) ((none))  
https://bugs.launchpad.net/bugs/291760
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