Comment 1 for bug 307944

Thank you for taking the time to report this bug and helping to make Ubuntu better. Unfortunately we can't fix it without more information. Could you post the results of the following.
what version of Ubuntu:
 lsb_release -a

What kernel are you using:
 uname -a

Please include the information requested from the "Reporting Sound Bugs" section of https://wiki.ubuntu.com/DebuggingSoundProblems as separate attachments. In addition there are some procedures on this page that might help you solve your problem. At the bottom of the page there are three links that discuss sound problems further.