[alsa-devel] [PATCH] ALSA: HDA: Fix front mic on Dell Precision M6500

[Raymond Yau]

2010/8/24 David Henningsson <david.henningsson at canonical.com>

> 2010-08-24 02:57, Raymond Yau skrev:
> > 2010/8/24 David Henningsson <david.henningsson at canonical.com>
> >
> >> I admit that the best thing would be to make the driver support all
> >> three mics, but at this point, the alsa driver can only support two, one
> >> called "mic" and one called "front mic". I believe the best choice is to
> >> select the internal mic as "front mic" and the mic jack on the laptop as
> >> "mic", thus leaving the docking station mic jack non-functional.
> >>
> >> The behavior without this patch is to select the mic jack on the laptop
> >> as "mic" and the mic on the docking station as "front mic", thus leaving
> >> the internal mic non-functional in all cases, and that regardless of you
> >> have a docking station or not.
> >>
> >> 2010-08-23 21:07, Jerone Young skrev:
> >>> For laptops you would want to take preference of the docking jack over
> >>> the interal mic if you are in a docking station.
> >>>
> >>> So if you do plug into a docking station and you have a microphone in
> >>> the docking station, a user would want to use that over the internal
> >>> microphone. You wouldn't want the laptop internal mic preferred over
> the
> >>> docking station microphone.
> >>>
> >>>                               Thanks,
> >>>                                       Jerone
> >>>
> >>> On Mon, 2010-08-23 at 21:03 +0200, David Henningsson wrote:
> >>>> The BIOS of Dell Precision M6500 lists both 0x0e and 0x11 as
> >>>> front mics, and the driver only supports one front mic. This
> >>>> commit adds a quirk for preferring node 0x11 (internal mic) to
> >>>> node 0x0e (possibly docking station mic).
> >>>>
> >>>> Alsa-info reference:
> >>>> http://launchpadlibrarian.net/54232083/alsa-info.txt.xyFVpIysHt
> >>>>
> >>
> >
> > There are two ADC , this mean that the correct model should provide two
> > capture subdevices instead of one
> >
> > Node 0x15 [Audio Input] wcaps 0x1d0541: Stereo
> >   Device: name="STAC92xx Analog", type="Audio", device=0
> >   Converter: stream=1, channel=0
> >   SDI-Select: 0
> >   Power: setting=D0, actual=D0
> >   Delay: 13 samples
> >   Connection: 1
> >      0x17
> >   Processing caps: benign=0, ncoeff=0
> > Node 0x16 [Audio Input] wcaps 0x1d0541: Stereo
> >   Converter: stream=0, channel=0
> >   SDI-Select: 0
> >   Power: setting=D0, actual=D0
> >   Delay: 13 samples
> >   Connection: 1
> >      0x18
> >   Processing caps: benign=0, ncoeff=0
>
> I don't disagree. Feel free to write a patch for that, I assume Takashi
> will take it if it's written well enough and according to his/Linus's
> standards.
>
>
Have you try model=mic-ref  ?

it seem there are already two capture subdevice using hda-emu

Attach PCM dev 0, name STAC92xx Analog, type audio, play #1, capture #2