I have the same problem of walkken
I have sound but my internal microphone is not recognized.

My computer is a DELL Inspiron N5030

root@galileo:/home/carlos# uname -a
Linux galileo 2.6.36.3-candela #1 SMP Sun Jan 9 18:34:42 CET 2011 x86_64 
GNU/Linux

root@galileo:/home/carlos# aplay -l
**** Lista de PLAYBACK dispositivos hardware ****
tarjeta 0: Intel [HDA Intel], dispositivo 0: ALC259 Analog [ALC259 Analog]
  Subdispositivos: 1/1
  Subdispositivo #0: subdevice #0

root@galileo:/home/carlos# dpkg -l | grep alsa
ii  alsa-base                                     1.0.23+dfsg-1ubuntu4          
                    ALSA driver configuration files
ii  alsa-utils                                    1.0.23-2ubuntu3.4             
                    Utilities for configuring and using ALSA
ii  bluez-alsa                                    4.69-0ubuntu2                 
                    Bluetooth audio support
ii  gstreamer0.10-alsa                            0.10.30-2                     
                    GStreamer plugin for ALSA

head -n 1 /proc/asound/card*/codec#*
Codec: Realtek ALC259

root@galileo:/home/carlos# cat /proc/asound/cards
 0 [Intel          ]: HDA-Intel - HDA Intel
                      HDA Intel at 0xf6afc000 irq 41

cat /proc/asound/modules 
 0 snd_hda_intel

carlos@galileo:~$ lspci | grep -i audio
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio 
Controller (rev 03)

Thank you for the help, and excuse me for my english.

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https://bugs.launchpad.net/bugs/714875

Title:
  [Realtek ALC259] ALSA test tone not correctly played back. Sound works
  on Win7 with laptop speakers, sound works on Ubuntu 10.10 with
  headphones, but not with laptop speakers

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