Comment 8 for bug 1332900

> I tried to re-submit the bug report but I am not really sure what the alsa-base.conf should look like or how to reinstall/overwrite.

These commands will replace your alsa-base.conf with the original one:
sudo mv /etc/modprobe.conf/alsa-base.conf ~/alsa-base.conf.old
sudo apt-get install alsa-base --reinstall

Otherwise I think Raymond is right, you need to experiment a bit with hdajackretask (in the alsa-tools-gui package) to find the internal speaker, because BIOS does only indicate 0x14 as speaker - and that's probably the subwoofer if that's the only thing you hear audio from.