linux ath9k slow wireless

I was setting up a new wifi card on Kubuntu 12.04 and the wireless was really slow and inconsistent. Websites would not load and pings would be anywhere from 2 ms to 5000 ms. Some didn’t return at all. I found a post about reducing the wifi tx power but it didn’t help. However, changing some modules settings did the trick.

To test I did

sudo modprobe -r ath9k
sudo modprobe ath9k nohwcrypt=1

Immediately wireless started behaving better. Great speed, pings consistent. To make this change permanent I did

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


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