Comment 1 for bug 127599

Too bad your efforts didn't work out yet. To be able to analyse the problem, we need some more information. Please look at https://help.ubuntu.com/community/DebuggingSoundProblems , especially the section "Reporting Sound Bugs".

Also, make sure that you really tried all controls in alsamixer - not only unmuting everything, but also muting for example the capture monitor, if you have any (see comment from Miklosi Attila on http://alsa-project.org/alsa-doc/doc-php/template.php?company=Intel&card=ICH+southbridge+AC97+audio.&chip=440MX%2C+i810%2C+i810E%2C+i820%2C+ICH4%2C+ICH5%2C+ICH6&module=intel8x0 ).