[HDA-Intel - HDA Intel, recording] No sound at all

[Simon Baldwin]

Internal microphone not detected and so not working on Macbook Air 1,1

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: simon 1464 F.... pulseaudio
CurrentDesktop: Unity
Date: Fri Apr 29 23:49:42 2016
InstallationDate: Installed on 2015-08-27 (246 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaRecordingTest: ALSA recording test through plughw:Intel failed
Symptom_Card: Built-in Audio - HDA Intel
Symptom_DevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: simon 1464 F.... pulseaudio
Symptom_Type: No sound at all
Title: [HDA-Intel - HDA Intel, recording] No sound at all
UpgradeStatus: Upgraded to xenial on 2016-04-21 (7 days ago)
dmi.bios.date: 03/17/08
dmi.bios.vendor: Apple Inc.
dmi.bios.version: MBA11.88Z.00BB.B03.0803171226
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: Mac-F42C8CC8
dmi.board.vendor: Apple Inc.
dmi.board.version: PVT
dmi.chassis.asset.tag: Asset Tag#
dmi.chassis.type: 2
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-F42C8CC8
dmi.modalias: dmi:bvnAppleInc.:bvrMBA11.88Z.00BB.B03.0803171226:bd03/17/08:svnAppleInc.:pnMacBookAir1,1:pvr1.0:rvnAppleInc.:rnMac-F42C8CC8:rvrPVT:cvnAppleInc.:ct2:cvrMac-F42C8CC8:
dmi.product.name: MacBookAir1,1
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.