[Bug 540827] Re: ar9170usb wifi module crash + instabile connection

[ngc2997]

This somehow seems to be related to periodic scanning for other APs in
range (e.g., NetworkManager does this). When configured manually using
wpa_supplicant, I found the connection to be stable, unless I ran iwlist
scan commands periodically - doing so reproducibly kills the connection
after a random amount of time (I've seen this happen after five minutes
as well as over an hour), rendering the device unusable afterwards until
it is replugged.

There is a patched version of NetworkManager that does not perform
regular scans while a connection is established (see
https://launchpad.net/~volanin/+archive/ppa), which provides a stable
workaround for the problem; since I've been using that version, the
wireless connection has been absolutely stable here. Also, NM 0.8.1 will
regularly feature non-scanning behaviour for connections locked to a
specific BSSID.

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ar9170usb wifi module crash + instabile connection
https://bugs.launchpad.net/bugs/540827
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