Asus Vivobook s400 (Ateros AR9485) very slow internet on Ubuntu 12.10

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http://askubuntu.com – After installing ubuntu 12.10, everything worked fine. I had full speed through wifi and the connection was stable. I did a apt-get upgrade and rebooted the computer. First it would't connect to the router anymore. After doing this trick (http://ubuntuforums.org/showthread.php?t=2018238) i was able to connect again, but now the speed won't go more than 4 kB/s (should be 1,3 MB/s). If i use an usb wifi dongle, everything works as it should. All suggestions are appreciated Regards (HowTos)