Ralink RT5370 chip

To find chipset: lsusb -v

Devices with RT5370 chipset do not work out of the box in Ubuntu 11.10 to 12.04. They work automatically in Ubuntu 12.10. 

https://help.ubuntu.com/community/WifiDocs/Device/Tenda_W311M

 http://ubuntuforums.org/showthread.php?t=1800178&highlight=rt5370sta