Comment 89 for bug 1516025

               [ALC668_FIXUP_DELL_ALIENWARE] = {
  .type = HDA_FIXUP_PINS,
  .v.pins = (const struct hda_pintbl[]) {
/* give up the headphone jack 0x16 to test the headset mic */
                        { 0x16, 0x411111f0 }, /* once headset mic work, you need to use preferred DAC to select which two pins share volume control */
                        { 0x1a, 0x90100111 }, /* internal subwoofer */
   { 0x1b, 0x03a1113c }, /* use as headset mic, without its own jack detect */
   { }
  },
  .chained = true,
  .chain_id = ALC668_FIXUP_HEADSET_MODE
 },

+ SND_PCI_QUIRK(0x1028, 0x05a9, "Dell Alienware14", ALC668_FIXUP_DELL_ALIENWARE),
 SND_PCI_QUIRK(0x1028, 0x05d8, "Dell", ALC668_FIXUP_DELL_MIC_NO_PRESENCE),
 SND_PCI_QUIRK(0x1028, 0x05db, "Dell", ALC668_FIXUP_DELL_MIC_NO_PRESENCE),