I have the same problem on two MacBook Pro 9,4 (non-retina, 2012) with a fresh install of precise (one of them) and quantal (the other one). They have a Cirrus Logic CS4206 (cf. attached alsa-info-2012-11-14-without- trrs-mic-hp.txt and alsa-info-2012-11-14-with-trrs-mic-hp.txt).
!!HDA-Intel Codec information Codec: Cirrus Logic CS4206 ... Subsystem Id: 0x106b5200 I found this thread on the alsa-devel mailing list: http://thread.gmane.org/gmane.linux.alsa.devel/95022 and followed some of the 'experiments' which the OP performed. hda-jack-sense-test first gave me an error: $ sudo hda-jack-sense-test [sudo] password for darabi: Traceback (most recent call last): File "/usr/bin/hda-jack-sense-test", line 47, in <module> codec = HDACodec(cardindex, codecindex) File "/usr/share/snd-hda-tools/hda_codec.py", line 1036, in __init__ self.parse_proc() File "/usr/share/snd-hda-tools/hda_codec.py", line 1135, in parse_proc self.proc_codec = HDACodecProc(self.card, self.device, file) File "/usr/share/snd-hda-tools/hda_proc.py", line 478, in __init__ self.parse(proc_file) File "/usr/share/snd-hda-tools/hda_proc.py", line 672, in parse node.add_digital(line[11:]) File "/usr/share/snd-hda-tools/hda_proc.py", line 295, in add_digital self.wrongfile('unknown dig1 bit %s' % repr(b)) File "/usr/share/snd-hda-tools/hda_proc.py", line 143, in wrongfile raise ValueError, "wrong proc file format (%s)" % msg ValueError: wrong proc file format (unknown dig1 bit 'Non-Copyright') As you can see in the attached alsa-info, the 'Digital' line reads Digital: Preemphasis Non-Copyright on my system. So I changed hda_proc.py: 283c283 < 'Copyright': DIG1_BITS['COPYRIGHT'], --- > 'Non-Copyright': DIG1_BITS['COPYRIGHT'], and now have essentially the same output as the previous posters: # without TRRS headset with microphone $ sudo hda-jack-sense-test -a Pin 0x09 (Green HP Out): present = No Pin 0x0a (Internal Speaker): present = No Pin 0x0b (Internal Speaker): present = No Pin 0x0c (Blue Line In): present = No Pin 0x0d (Internal Mic): present = No Pin 0x0e (Not connected): present = No Pin 0x0f (White SPDIF In): present = No Pin 0x10 (White SPDIF Out): present = No Pin 0x12 (Pink Mic): present = No Pin 0x15 (Not connected): present = No # WITH TRRS headset with microphone $ sudo hda-jack-sense-test -a Pin 0x09 (Green HP Out): present = Yes Pin 0x0a (Internal Speaker): present = No Pin 0x0b (Internal Speaker): present = No Pin 0x0c (Blue Line In): present = No Pin 0x0d (Internal Mic): present = No Pin 0x0e (Not connected): present = No Pin 0x0f (White SPDIF In): present = No Pin 0x10 (White SPDIF Out): present = No Pin 0x12 (Pink Mic): present = No Pin 0x15 (Not connected): present = No You wrote > At this point I feel there is not much I can do without either having the > hardware at hand, or possibly somebody very patient to work with me remotely. I am the 'very patient' volunteer although in real life I'm not at all patient :) . We could meet on irc or jabber, whatever you prefer. -- 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. 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