Microphone and Line-Out not working on Dell Vostro 320

Microphone and Line-Out not working on Dell Vostro 320. The built-in speakers work well.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: alsa-base 1.0.22.1+dfsg-0ubuntu3
ProcVersionSignature: Ubuntu 2.6.32-21.31-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-21-generic i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: CONEXANT Analog [CONEXANT Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: ubuntu 1307 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfe8f8000 irq 16'
   Mixer name : 'Conexant CX20582 (Pebble)'
   Components : 'HDA:14f15066,102802f5,00100300'
   Controls : 12
   Simple ctrls : 10
Date: Thu Apr 15 16:54:27 2010
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Alpha i386 (20100415)
PackageArchitecture: all
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: alsa-driver
dmi.bios.date: 10/27/2009
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.2.0
dmi.board.name: 0N867P
dmi.board.vendor: Dell Inc.
dmi.board.version: A01
dmi.chassis.type: 3
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: Not Specified
dmi.modalias: dmi:bvnDellInc.:bvr1.2.0:bd10/27/2009:svnDellInc.:pnVostro320:pvr00:rvnDellInc.:rn0N867P:rvrA01:cvnDellInc.:ct3:cvrNotSpecified:
dmi.product.name: Vostro 320
dmi.product.version: 00
dmi.sys.vendor: Dell Inc.