Comment 14 for bug 546769

I have now researched this issue, and it seems like since only a week back, there is a quirk for all sony vaios having the ALC269 chip.

This means that if you retry https://wiki.ubuntu.com/Audio/InstallingLinuxAlsaDriverModules *now*, it should work without further changes.

Quoting some code below, I don't know if it makes sense to you:

 [ALC269_FIXUP_SONY_VAIO] = {
  .verbs = (const struct hda_verb[]) {
   {0x19, AC_VERB_SET_PIN_WIDGET_CONTROL, PIN_VREFGRD},
   {}

static struct snd_pci_quirk alc269_fixup_tbl[] = {
 SND_PCI_QUIRK_VENDOR(0x104d, "Sony VAIO", ALC269_FIXUP_SONY_VAIO),