Comment 23 for bug 201591

Please wait for the ubuntu-modules and restricted-modules to become available for your kernel since there is a high probability of chances that your sound card drivers are in these packages. Alsa is installed but won't magically make your sound card work without drivers, which are sometime in the ubuntu-modules and restricted-modules. If it still does not work once the packages become available, please open another bug report to help this problem getting fixed correctly. Thanks