does the user manual or laptop specifovation mention about the support
of conventional Mic with this combo Jack ?
if you using headset (TRRS), headset Mic pin 0x1b was set to vref50
,you may need to disable the Mic pin 0x1b when you using headphone
(TRS) or unpluggef
On some machines, there is a headset jack that can support both
headphone, headsets (of both CTIA and OMTP type) and mic-in.
On other machines, the headset jack supports headphone, headsets
(both CTIA and OMTP), but not mic-in.
+ [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 */
+ { }
+ },
+ .chained = true,
+ .chain_id = ALC668_FIXUP_HEADSET_MODE
+ },
+ [ALC668_FIXUP_HEADSET_MODE] = {
+ .type = HDA_FIXUP_FUNC,
+ .v.func = alc_fixup_headset_mode_alc668,
+ },
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https://bugs.launchpad.net/bugs/1252733
Title:
[XPS 12-9Q33, Realtek ALC668, Black Headphone Out, Left] Background
noise or low volume
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