I bought an MSI Wind U135 Netbook. It came with Windows 7 Starter, so I installed Xubuntu and Enlightenment first thing. I have gotten everything to work except for the audio.
It seems that there is an audio driver installed and in use (The Intel HD Audio driver), however, I can turn all channels up and nothing plays. The beep driver works, and if I turn the Microphone channels up too high then I get loud feedback from the speakers, but nothing else will play. I have tried multiple kernels, including from Ubuntu Netbook edition. All have the same problem. I was unable to determine what audio card is actually present in the machine, MSI's website is a pain, and I couldn't find anything conclusive online.
I purchased the laptop in Taiwan, but I believe it is the same as the US version hardware-wise, except for the Chinese on the keyboard obviously.

what about alsamixer? what it says?

I have a US market U135. I used an EasyPeasy load, and got poor quality sound. I suspect there is either a design problem or a software-driven sound driver, because I have it dual-boot; and the sound from winXP is so bad that music is not playable, and Skype is impossible. Do you get reasonable sound from win7?

Well, unfortunately, Windows didn't stick around long enough for me to hear the sound work. Installing linux was pretty much the first thing I did. So, I do not know. Alsamixer says a lot of things, what specifically would you like to know?