On Sat, 25 Jul 2020 12:20:41 +0200, Yasushi SHOJI wrote:
Hi all,
I noticed that my 3 years old Lenovo X270 with Intel HDA & RealTek ALC298 doesn't work with 3.5 mm audio combo jack with 4 pole CTIA. A bit of googling showed me that `snd-hda-intel` module can take some options like `model` to run some fix ups. and I have found that `model=alc298-dell1` seems to at least work. But its gain is way too low. It's mostly just noise. It sounds like my mic is on the line-in.
So, I opened `patch_realtek.c` to see what's going on. I found the following but not sure what the values for `.v.pins` are for.
[ALC298_FIXUP_DELL1_MIC_NO_PRESENCE] = { .type = HDA_FIXUP_PINS, .v.pins = (const struct hda_pintbl[]) { { 0x18, 0x01a1913c }, /* use as headset mic, without its own jack detect */ { 0x1a, 0x01a1913d }, /* use as headphone mic, without its own jack detect */ { } }, .chained = true, .chain_id = ALC269_FIXUP_HEADSET_MODE },In `apply_fix(), these `.v.pins` values are passed to `snd_hda_apply_pincfgs()` but I can't find what values mean. Would someone please enlighten me?
My questions are
- How can I found out which pin goes where. There is x270 schematics on the net but not sure it's correct.
It's often done by trial-and-error. Or sometimes the information can be extracted from Windows driver *.INI file. Or you can try hdajackretask program for figuring out those.
- What does the value, ie, 0x01a1913d, represent?
At best take a look at HD-audio specification. You can find easily on the web.
Those are "pin configuration" values where various attributes like the jack type, the jack color, etc are embedded. The HD-audio driver looks through those configurations and determine the set up based on them.
HTH,
Takashi