我的rt73usb用内核提供的驱动有很多问题 速度慢 和会影起X变慢等
需要使用新的驱动 http://rt2x00.serialmonkey.com/rt73-cvs-daily.tar.gz
编译 安装 然后设置

sudo gedit  /etc/network/interfaces
内容如下
auto lo
iface lo inet loopback


wireless-key s:asdfg
wireless-essid Xia's_Home

#WORKING DYNAMIC AES/WPA CONFIG
auto wlan0
iface wlan0 inet dhcp
pre-up ifconfig wlan0 up
pre-up iwconfig wlan0 essid "Xia's_Home"
pre-up iwconfig wlan0 mode managed
pre-up iwconfig wlan0 key "s:asdfg"


sudo gedit  /etc/modprobe.d/blacklist
添加如下内容
####################################################
blacklist rt2500usb
blacklist rt73usb
blacklist rt2x00usb
blacklist rt2x00lib
blacklist ath_pci
#blacklist ipv6