Comment 103 for bug 414560

On Sat, Oct 31, 2009 at 9:19 PM, Rachel Greenham
<email address hidden> wrote:
> I continued to have other issues (poor signal strength, the excessive
> disassociates/reassociates of this bug report, occasional loss of
> connection even though network manager thought it was OK) up until and
> including the release, but earlier comments on this bug report suggested
> installing the backports module (linux-backports-modules-karmic) and
> since I did so the performance has, for me at least, been basically
> perfect. Suggest trying that for your issue too. :-)

The reason for occasional "perceived" loss of connectivity is because
of the background scanning initiated by NM.
Basically, when the device starts a scan for available networks, it
has to be reset to switch frequencies.
This is true for (almost?) all the wireless devices and is not
particular to ath9k based devices.

As soon as the scan finishes, NM just does a single hand-shake with
the previously associated AP and continues on with the connection.