Public bug reported:

With gnome-volume-control, it's possible to select the volume output I
want between 15% and 100%. When the seound volume is set below 15 %,
there is no sound. The problem is that the sound at 16 % is too loud.

The solution given in Bug #420578 in comment 8 stops the behavior :
replacing all instance of "volume = merge" with "volume = ignore" in
/usr/share/pulseaudio/alsa-mixer/paths/analog-output.conf*. But this
solution cause the login sound to be very loud whatever was the sound
level in the last session.

Other people got the same problem as reported in this forum :
http://ubuntuforums.org/showthread.php?t=1309427

ProblemType: Bug
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 2/2
   Subdevice #0: subdevice #0
   Subdevice #1: subdevice #1
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  marc       3073 F.... pulseaudio
 /dev/snd/pcmC0D0p:   marc       3073 F...m pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfebfc000 irq 21'
   Mixer name   : 'SigmaTel STAC9205'
   Components   : 'HDA:838476a0,102801f1,00100204 
HDA:14f12c06,14f1000f,00100000'
   Controls      : 24
   Simple ctrls  : 15
Date: Sun Nov  8 08:56:13 2009
DistroRelease: Ubuntu 9.10
NonfreeKernelModules: nvidia
Package: alsa-base 1.0.20+dfsg-1ubuntu5
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 LANG=fr_CA.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
SourcePackage: alsa-driver
Uname: Linux 2.6.31-14-generic x86_64

** Affects: alsa-driver (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug

-- 
No sound when volume control is set at a low level on Karmic
https://bugs.launchpad.net/bugs/478365
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