Packard Bell Dot MA built in mic not working

[narom]

Binary package hint: libao-pulse

Description: Ubuntu 9.10
Release: 9.10

pulseaudio:
  Installed: 1:0.9.19-0ubuntu4
  Candidate: 1:0.9.19-0ubuntu4
  Version table:
 *** 1:0.9.19-0ubuntu4 0
        500 http://gb.archive.ubuntu.com karmic/main Packages
        100 /var/lib/dpkg/status

00:14.2 Audio device: ATI Technologies Inc SBx00 Azalia (Intel HDA)

External mic not work with Karmic

ProblemType: Bug
AplayDevices:
 **** List of PLAYBACK Hardware Devices ****
 card 0: SB [HDA ATI SB], device 0: ALC272 Analog [ALC272 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: SB [HDA ATI SB], device 0: ALC272 Analog [ALC272 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: pmoran 1769 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'SB'/'HDA ATI SB at 0xf0500000 irq 16'
   Mixer name : 'Realtek ALC272'
   Components : 'HDA:10ec0272,1025028c,00100001'
   Controls : 14
   Simple ctrls : 9
CheckboxCommand: alsa_record_playback
CheckboxTest: alsa_record_playback_internal
Date: Mon Oct 26 16:26:44 2009
DistroRelease: Ubuntu 9.10
Package: alsa-base 1.0.20+dfsg-1ubuntu5
PackageArchitecture: all
ProcEnviron:
 SHELL=/bin/bash
 LANG=en_GB.UTF-8
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
SourcePackage: alsa-driver
Tags: checkbox-bug
Uname: Linux 2.6.31-14-generic x86_64