Comment 8 for bug 951709

Perhaps it will be helpful to note that, just as Jaime Alberto Silva (jaimealbertosilva) found, turning off the hardware encryt has worked wonders for me., My network performance (as seen from just general use of FF) went from spotty and slow to lightening fast. I was also able to move the network boot from first in the boot order which also leads to faster cleaner boots (especialy when ethernet is plugged in). After much searching and reading about this problem, this simple fix does the trick. To be more specific, I am on a fairly fresh 12.04 with all (as far as I can tell) recommended updates applied. As found on

http://ubuntuforums.org/showthread.php?mode=hybrid&t=1942326&highlight=atheros+acer+722

I first tried these commands:

sudo modprobe -rfv ath9k
sudo modprobe -v ath9k nohwcrypt=1

with functionally great results and then

made it permanent by creating the file

/etc/modprobe.d/ath9k.conf

and adding this line (followed by a <cr> which i'm not sure was needed...)

options ath9k nohwcrypt=1

i then moved the netboot from first in the boot order and all still works great!

just for the record:

rone@ronsAcerUbu:~$ lspci -nnk | grep -iA2 net
06:00.0 Ethernet controller [0200]: Atheros Communications Inc. AR8152 v2.0 Fast Ethernet [1969:2062] (rev c1)
 Subsystem: Acer Incorporated [ALI] Device [1025:0598]
 Kernel driver in use: atl1c
--
07:00.0 Network controller [0280]: Atheros Communications Inc. AR9485 Wireless Network Adapter [168c:0032] (rev 01)
 Subsystem: Foxconn International, Inc. Device [105b:e047]
 Kernel driver in use: ath9k

Let me know if you need any more info.