I actually just posted on this. I believe this is a near complete list of the
802.11n wireless chipsets that are free software friendly:
RTL8187L/RTL8187B/RTL8187 - USB G wireless Adapters
AR9271/AR9170/AR7010+AR9280 - USB N Wireless Adapters
AR9280/AR9281/AR9285/AR9287 - PCI/PCI Express Wireless N Cards (desktop and
laptop cards)
* There is one Broadcom chipset left off the list that is also free software
friendly technically although from my understanding/recollection its not a
good choice. It's a PCI/PCIe chipset. One of the developers advised me
against using it. This was a developer who actually worked at and did the
work on behalf of Broadcom (from what I recall/understand). That said there
is at least one user here whose been using it without issue. A user of one
though isn't really a good evaluation to go off. Given the combined info I
have on it from various sources/people/etc I'd advise not using it and going
with one of the other chipsets. I'd also advise against the AR9170 chipset at
this time even though it is a good free software friendly chipset. It's based
on an older draft N spec and may/does not work as well with some routers.
http://libre.thinkpenguin.com/
You can find the wifi adapters amongst other free software friendly hardware
with the above chipsets at the above site. You can order from a US or UK
warehouse with shipment almost anywhere. If you do order 25% of the profits
will go to the Trisquel project too.
* Disclaimer: I'm the CEO of the company above.
