> I just booted from ubuntu-12.04.5-desktop-amd64.iso, played a music
file, opened alsamixer, and discovered that; changing Master M volume
independently changed the internal speaker volume. In 14.04 Master M is
muted by default, unmuting and raising the volume has no effect.

You have to turn off headphone jack sense and line jack sense controls
to set mute enable selector JSMT[2:0] to 0

http://cgit.freedesktop.org/pulseaudio/pulseaudio/patch/src/modules/alsa/mixer/paths?id=ba0203c4c0938fd646cf559456e3d691fc889029

you have to send email to the author if  you think it is a regression of
this patch

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https://bugs.launchpad.net/bugs/893210

Title:
  [Dell OptiPlex GX620 - AD1981b, playback] No sound at all

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