On a Thinkpad t42p with AR5212 hardware and ath5k kernel module, I was
having crashes entirely without chrome, which seems to indicate that
there is something fundamentally wrong with the stock lucid ath5k
module.  The problem was less frequent when using only firefox (or no
browser) than when using chrome/chromium (maybe libaio is
exacerbating?).  I tried the upstream kernel to no avail.  What finally
seems to have worked out for me was installing the 'linux-backports-
modules-wireless' package from lucid-updates.  The wifi has, at least,
stabilized enough to stop randomly locking the system (even when using
chrome or chromium).  Turning on bookmark sync does still lock the
system, so it seems like there is more than one thing amiss in this
stack.

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ath5k system freeze induced by Chrome bookmark sync
https://bugs.launchpad.net/bugs/546871
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