'lspci' shows that my wireless hardware (on an Acer Aspire 5737z) is:

11:00.0 Network controller: Atheros Communications Inc. AR928X Wireless
Network Adapter (PCI-Express) (rev 01)

When I use the ath9k module installed by the linux-backports-
modules-2.6.31-19-generic package,  the wireless connectivity "freezes"
for a few seconds every time wpa_supplicant logs CTRL-EVENT-SCAN-
RESULTS.

When the linux-backports-modules-2.6.31-19-generic package is purged and
I use the modules provided by linux-image-2.6.31-19-generic, it is
better but not 100%. It no longer freezes every 2 minutes, but it still
happens regularly (several times an hour).

Hope this helps someone :)

-- 
wpa_supplicant  CTRL-EVENT-SCAN-RESULTS crashes ath9k wireless driver
https://bugs.launchpad.net/bugs/460886
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