Very low audio in linux Ubuntu 8.10

Hi Guis.. Im from Italy so sorry for my english xD this is my 1st topic.. well.. I installed UBUNTU 8.10 on my laptop ASUS Z9200VM every is perfect..!! and the audio just works but very low..! when I had windows on my computer the audio worked very good, now I can't listen well a song or a film bicoase the audio works at the minimal power I think is a driver problem, Alsamixer is installed v.1.0.17 and in setting on 100% but the audio however doesn't work well !! I download RealTek driver for linux..! ----> [url]http://218.210.127.131/downloads/downloadsView.aspx?Langid=1&PNid=14&PFid=24&Level=4&Conn=3&DownTypeID=3&GetDown=false#2[/url] is a tar.bz2 driver package.. and Doesn't WOrk--------> Help thanks and sorry for my disgusting english xDD