I installed the ubuntu 8.04 yesterday. After installation i tried to play a video but was unable and told to download some drivers from the net. As suggested i got some drivers installed and the video worked but the sound was not available. I didn’t cared about it then and just started playing around. After a while I suspended the system as i had to take my meal. After i again started the system I again tried to play a song. And hurray that worked. I thought the problem was solved. But after I again did a restart. The sound was again lost. So the sound worked only when I suspend and again start. It was a bug with the sound driver. I did a search on net and found out i was not only the one with that problem and several posts were made about it. I can provide you some links if you are having same problem.

http://jaux.net/2008/04/27/solution-to-lenovo-y410-sound-problem-ubuntu-804/

Follow the instructions there and you can get your sound working on lenovo y410.But the sound again doesn’t work on headphone. It works on speakers only.