[alsa-devel] mic on macbook air

Justin P. Mattock justinmattock at gmail.com
Mon Sep 27 18:36:46 CEST 2010

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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