https://blog.faceutil.com/2017/03/26/%eb%a6%ac%ec%96%bc%ed%85%8d-%ec%82%ac%ec%9a%b4%eb%93%9c-%eb%93%9c%eb%9d%bc%ec%9d%b4%eb%b2%84realtek-ac97-audio-%eb%8b%a4%ec%9a%b4%eb%a1%9c%eb%93%9c-%ec%bb%b4%ed%93%a8%ed%84%b0-%ec%86%8c%eb%a6%ac/