[alsa-devel] mic on macbook air

Reimundo Heluani rheluani at gmail.com
Mon Sep 27 18:40:34 CEST 2010

As far as I know I wrote the only patch for macbook air 2,1 that
shipped with 2.6.34 but that was for the internal speaker only. I
could never get the mic going.



On Mon, Sep 27, 2010 at 1:36 PM, Justin P. Mattock
<justinmattock at gmail.com> wrote:
> On 09/27/2010 07:39 AM, Takashi Iwai wrote:
>> At Mon, 27 Sep 2010 00:32:03 +0200,
>> Reimundo wrote:
>>> Hello list, from time to time I spend some time trying to get the mic
>>> working on a Macbook air 2,1. I tried looking at the relevant info from
>>> the corresponding kernel extensions on mac os X. The codec has  "Vendor
>>> Id: 0x10ec0885" so the relevant part of the info.plist on mac os X reads
>>> <dict>
>>> <key>MicAttributes</key>
>>> <integer>28</integer>
>>> <key>MicInfo</key>
>>> <string>Sampled on rising edge</string>
>>> <key>NodeID</key>
>>> <integer>39</integer>
>>> <key>PinConfigDefault</key>
>>> <integer>2426405136</integer>
>>> </dict>
>>> Which tells me nothing. In particular I don't have a node 0x27=39 (at
>>> least not that hda-analyzer sees) so it's not surprising that if I send
>>> the corresponding verbs to set_config_default I don't get anything.
>>> Also, I don't see how setting the pinconfigdefault could affect my not
>>> having the mic working (anyway I tried setting those pinconfigdefaults
>>> that put the node as a fixed mic on all nids 0x19-0x1c to no avail)
>>> As for the sampled on rising edge, I don't know how to use this info.
>>> any ideas?
>> Justin Mattock made once some patches for MacBookAir, but they are
>> pending because no one tested yet.
>> Justin, could you repost the patches (rebase if needed) for testing
>> again?
>> thanks,
>> Takashi
> Sure I can rebase them... but there's no guarantee that they work...
> from what I remember the mic on the macbookAir is not shown with the codec
> file so you might have to change the pins around.
> Justin P. Mattock

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