I can confirm this after an upgrade from gutsy to hardy. My PC is a toshiba 
satellite A100-237. Sound worked perfectly in Gutsy . Furthermore there are no 
more inputs (no microphone), only outputs. Pulseaudio seems to be functioning 
properly, with proper level meters on playback, however no sound can be heard. 
KMix does not work. Media players (VLC , mplayer) are working as far as they 
are set to use the hardware device. Amarok with xine is unable to initialise 
audio devices. Alsamixer and amixer does not work:
[EMAIL PROTECTED]:~/muzik/testfiles$ alsamixer -c 0
alsamixer: function snd_mixer_load failed: No such file or directory

[EMAIL PROTECTED]:~/muzik/testfiles$ amixer -c 0
amixer: Mixer hw:0 load error: No such file or directory

and my specs:

alsa-base: Version: 1.0.16-0ubuntu2

[EMAIL PROTECTED]:~$ uname -a
Linux kane-laptop 2.6.24-8-generic #1 SMP Thu Feb 14 20:40:45 UTC 2008 i686 
GNU/Linux

[EMAIL PROTECTED]:~$ lspci | grep Audio
00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition 
Audio Controller (rev 02)

[EMAIL PROTECTED]:~$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC861 Analog [ALC861 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: Intel [HDA Intel], device 6: Si3054 Modem [Si3054 Modem]
  Subdevices: 0/1
  Subdevice #0: subdevice #0

[EMAIL PROTECTED]:~/muzik/testfiles$ asoundconf list
Names of available sound cards:
Intel

-- 
alsamixer broken in hardy - intel hda
https://bugs.launchpad.net/bugs/192382
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