Jan,
I owe you a beer! I have an HP G62 laptop with this wireless card:
02:00.0 Network controller: Atheros Communications Inc. AR9285 Wireless Network 
Adapter (PCI-Express) (rev 01)

I have an Asus RT-N10 router, which I had been using happily with
Wireless-N+WPA2 while on Maverick. I usually got local file copy speeds
of 3-4 MB/sec over this wireless network... until I upgraded to Natty,
then suddenly my transfer rate dropped to 200 KB/sec, although
everything looked fine according to iwconfig, which claimed it was
connected at 150 Mbit/sec.

I tried your suggestion of creating /etc/modprobe.d/ath9.conf with :
     options ath9k nohwcrypt=1

and rebooted, and now I'm back to 3MB/sec local transfer speeds. Thanks
for the suggestion!

By the way, I also have a Linksys WRT54G operating in WPA (not WPA2).
Transfer speeds to this router were fine in Maverick and Natty, even
before I tried this fix. So maybe this problem is limited to WPA2
networks?

Josh

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https://bugs.launchpad.net/bugs/754176

Title:
  ath9k wireless connection extremely slow

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