Comment 25 for bug 1414706

if you cannot use debug version, you can modify hdajacksense.c or use hda verb to check whether the codec can differentitate cita or omtp headset

static void alc_determine_headset_type(struct hda_codec *codec)
+{
+ int val;
+ bool is_ctia = false;
+ struct alc_spec *spec = codec->spec;
+
+ switch (codec->vendor_id) {
+ case 0x10ec0283:
+ alc_write_coef_idx(codec, 0x45, 0xd029);
+ msleep(300);
+ val = alc_read_coef_idx(codec, 0x46);
+ is_ctia = (val & 0x0070) == 0x0070;
+ break;
+ case 0x10ec0292:
+ alc_write_coef_idx(codec, 0x6b, 0xd429);
+ msleep(300);
+ val = alc_read_coef_idx(codec, 0x6c);
+ is_ctia = (val & 0x001c) == 0x001c;
+ break;
+ case 0x10ec0668:
+ alc_write_coef_idx(codec, 0x11, 0x0001);
+ alc_write_coef_idx(codec, 0xb7, 0x802b);
+ alc_write_coef_idx(codec, 0x15, 0x0d60);
+ alc_write_coef_idx(codec, 0xc3, 0x0c00);
+ msleep(300);
+ val = alc_read_coef_idx(codec, 0xbe);
+ is_ctia = (val & 0x1c02) == 0x1c02;
+ break;
+ }
+
+ snd_printdd("Headset jack detected iPhone-style headset: %s\n",
+ is_ctia ? "yes" : "no");
+ spec->current_headset_type = is_ctia ? ALC_HEADSET_TYPE_CTIA : ALC_HEADSET_TYPE_OMTP;