I am currently running Ubuntu 12.04 64-bit with a TP-Link TL-WN851ND wireless card. Every time I start up, anywhere between 0 and 60 seconds after the login screen appears, the computer freezes permanently and I am forced to power off. I managed to isolate the problem to the ath9k module, so I blacklisted ath9k and everything is running smoothly... Except now I can't use my wifi card.
Is there a way to fix ath9k? Or are there alternative drivers I can install? Thanks.