Comment 9 for bug 1299322

seem dell use 0x1b as headset mic for codec alc668 , you have to try assign speaker to the remaining unconnected pin complexes which support OUT and widcap support stereo

+ [ALC668_FIXUP_DELL_MIC_NO_PRESENCE] = {
+ .type = HDA_FIXUP_PINS,
+ .v.pins = (const struct hda_pintbl[]) {
+ { 0x19, 0x03a1913d }, /* use as headphone mic, without its own jack detect */
+ { 0x1b, 0x03a1113c }, /* use as headset mic, without its own jack detect */
+ { }