if you look at cs4207 datasheet, it can pan left or right channel this may min that it only need one pin complex for the mono internal mic and mono external mic
http://git.kernel.org/?p=linux/kernel/git/tiwai/sound.git;a=commitdiff;h=16337e028a6dae9fbdd718c0d42161540a668ff3;hp=5a83b4b5a391f07141b157ac9daa51c409e71ab5. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to alsa-driver in Ubuntu. https://bugs.launchpad.net/bugs/950494 Title: [Macbook Air 3,2] headset mic not recognized Status in “alsa-driver” package in Ubuntu: Incomplete Bug description: == Summary == Since upgrading a MacBook Air from 11.10 to 12.04 the headset microphone is no longer recognized. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: alsa-base 1.0.25+dfsg-0ubuntu1 ProcVersionSignature: Ubuntu 3.2.0-18.28-generic 3.2.9 Uname: Linux 3.2.0-18-generic x86_64 NonfreeKernelModules: nvidia AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24. ApportVersion: 1.94-0ubuntu2 Architecture: amd64 ArecordDevices: **** List of CAPTURE Hardware Devices **** card 0: NVidia [HDA NVidia], device 0: Cirrus Analog [Cirrus Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: jon 1864 F.... pulseaudio Card0.Amixer.info: Card hw:0 'NVidia'/'HDA NVidia at 0xd3280000 irq 16' Mixer name : 'Nvidia MCP89 HDMI' Components : 'HDA:10134206,106b3d00,00100301 HDA:10de000c,10de0101,00100200' Controls : 36 Simple ctrls : 12 Date: Thu Mar 8 21:09:23 2012 InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64+mac (20111012) PackageArchitecture: all SourcePackage: alsa-driver Symptom: audio Title: USB sound card not detected UpgradeStatus: Upgraded to precise on 2012-03-05 (3 days ago) dmi.bios.date: 11/18/10 dmi.bios.vendor: Apple Inc. dmi.bios.version: MBA31.88Z.0061.B01.1011181342 dmi.board.asset.tag: Base Board Asset Tag# dmi.board.name: Mac-942C5DF58193131B dmi.board.vendor: Apple Inc. dmi.board.version: MacBookAir3,2 dmi.chassis.type: 10 dmi.chassis.vendor: Apple Inc. dmi.chassis.version: Mac-942C5DF58193131B dmi.modalias: dmi:bvnAppleInc.:bvrMBA31.88Z.0061.B01.1011181342:bd11/18/10:svnAppleInc.:pnMacBookAir3,2:pvr1.0:rvnAppleInc.:rnMac-942C5DF58193131B:rvrMacBookAir3,2:cvnAppleInc.:ct10:cvrMac-942C5DF58193131B: dmi.product.name: MacBookAir3,2 dmi.product.version: 1.0 dmi.sys.vendor: Apple Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/950494/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
