[IDT 92HD81B1C5] Can't record using on-board mic

On this laptop using Lucid 10.04.1 with all the latest updates applied, I cannot record using the integrated microphone which should be beside the webcam, around the top side of the lid.

Recording using the external jack works as expected.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: alsa-base 1.0.22.1+dfsg-0ubuntu3
ProcVersionSignature: Ubuntu 2.6.32-24.42-generic 2.6.32.15+drm33.5
Uname: Linux 2.6.32-24-generic x86_64
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
AplayDevices:
 **** List of PLAYBACK Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 2/2
   Subdevice #0: subdevice #0
   Subdevice #1: subdevice #1
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: ubuntu 1657 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xd9660000 irq 22'
   Mixer name : 'IDT 92HD81B1C5'
   Components : 'HDA:111d76d5,1028040a,00100104 HDA:14f12c06,14f1000f,00100000'
   Controls : 18
   Simple ctrls : 12
Card1.Amixer.info:
 Card hw:1 'NVidia'/'HDA NVidia at 0xd3080000 irq 16'
   Mixer name : 'Nvidia ID b'
   Components : 'HDA:10de000b,10de0101,00100100'
   Controls : 0
   Simple ctrls : 0
Card1.Amixer.values:

Date: Thu Sep 2 12:28:09 2010
InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1)
PackageArchitecture: all
ProcEnviron:
 LANG=en_CA.utf8
 SHELL=/bin/bash
SelectedCard: 0 Intel HDA-Intel - HDA Intel
SourcePackage: alsa-driver
Symptom: audio
Title: [IDT 92HD81B1C5] Recording problem
dmi.bios.date: 01/30/2010
dmi.bios.vendor: Dell Inc.
dmi.bios.version: X51
dmi.board.name: RAMDEL
dmi.board.vendor: Dell Inc.
dmi.board.version: 0001
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrX51:bd01/30/2010:svnDellInc.:pnLatitudeE6410:pvr0001:rvnDellInc.:rnRAMDEL:rvr0001:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E6410
dmi.product.version: 0001
dmi.sys.vendor: Dell Inc.