Public bug reported:

Binary package hint: pulseaudio

On Lucid I am finding my sound easily distorts with the volume set to
30% or less.  I found a blog post at
http://phronetic.wordpress.com/2009/10/30/loud-and-distorted-sound-in-
ubuntu-9-10/ and observed that the PCM in alsamixer was always at 100%.
I followed the change described in the post and changed:

volume = merge
 to 
volume = ignore

Then restarted pulseaudio and the sound no longer distorts.

ProblemType: Bug
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  insanity   8111 F.... pulseaudio
 /dev/snd/pcmC0D0p:   insanity   8111 F...m pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfc100000 irq 22'
   Mixer name   : 'Realtek ALC888'
   Components   : 'HDA:10ec0888,1458e601,00100001'
   Controls      : 40
   Simple ctrls  : 22
CheckboxSubmission: 627843f773788cb8684bdb11b1715f9c
CheckboxSystem: 9038dc5b445882e24b06ebe5cf05c9fc
Date: Fri Mar 26 21:34:54 2010
DistroRelease: Ubuntu 10.04
NonfreeKernelModules: nvidia
Package: pulseaudio 1:0.9.22~0.9.21+stable-queue-32-g8478-0ubuntu12 [modified: 
usr/share/pulseaudio/alsa-mixer/paths/analog-output.conf.common]
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-17.26-generic 2.6.32.10+drm33.1
SourcePackage: pulseaudio
Uname: Linux 2.6.32-17-generic x86_64
mtime.conffile..etc.pulse.default.pa: 2010-02-20T22:57:37.213481
--- 
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  insanity   8111 F.... pulseaudio
 /dev/snd/pcmC0D0p:   insanity   8111 F...m pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfc100000 irq 22'
   Mixer name   : 'Realtek ALC888'
   Components   : 'HDA:10ec0888,1458e601,00100001'
   Controls      : 40
   Simple ctrls  : 22
CheckboxSubmission: 627843f773788cb8684bdb11b1715f9c
CheckboxSystem: 9038dc5b445882e24b06ebe5cf05c9fc
DistroRelease: Ubuntu 10.04
NonfreeKernelModules: nvidia
Package: alsa-base 1.0.22.1+dfsg-0ubuntu3
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-17.26-generic 2.6.32.10+drm33.1
Tags: lucid
Uname: Linux 2.6.32-17-generic x86_64
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare users

** Affects: pulseaudio (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug apport-collected lucid

-- 
pulseaudio volume over amplified for ICH8 82801H
https://bugs.launchpad.net/bugs/548707
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