Hi libolido ! I have also TP-LINK TLWN722NC WiFi USB adapter and I strugle with same problem. If you manage to install ath9k drivers (ar9271) sucessfuly - can you please explain in details sequence how you made it work?! I'm preaty sure not only my vould be very appretiated to you.
I'm not very familiar with Linux (just basic things with transfer files, edit them, set permisions in Linux) that's why it is little bit complicated to me.
Thanx in advance. Bye !