How to fix packets lost with AR9285 Driver in Ubuntu 12.04

What a nice surprise to see that after a fresh setup of Ubuntu 12.04, you can’t use Internet connection !

That’s really weird, and in the same time strange because I only have this issue with one Access Point.

I can connect to the Wireless Network, but after 5 seconds I can see that I lost 30% of packets and can not use Internet connection.

To see which driver you are runnning, please use this command :

my1@nano:~$ sudo lshw -class network
  *-network               
       description: Wireless interface
       product: AR9285 Wireless Network Adapter (PCI-Express)
       vendor: Atheros Communications Inc.
(...)

After investigation, I found a solution to fix this issue :

sudo rmmod ath9k
sudo modprobe ath9k nohwcrypt=1
echo "options ath9k nohwcrypt=1">>/etc/modprobe.d/ath9k.conf

Try now to connect to your Wifi, and that should be better.