Bug#662901: pulseaudio: Microsoft LifeChat LX-3000 USB Audio Headset DB issue with Volume Scale

[Nisha]

Package: pulseaudio
Version: 1.1-3
Severity: normal

Please bare with me as I don't normally report problems of this nature if ever.
Recently I noticed my headset the LX-3000 was not scaling audio right. Looking
in alsamixer confirmed this as moving the volume from 0 to 1 would move the
scale up on the pulseaudio volume from 0 to 30. I eventually came across a post
on the ubuntu forums detailing a work around:

http://ubuntuforums.org/showpost.php?p=9184651&postcount=4

Quote:

"There are a few variables which control how PulseAudio controls the volume.
You can either edit /etc/pulse/default.pa (you'll have to be root to do that)
to change the behavior for all users, or copy that file to ~/.pulse/default.pa
and then edit that file, to change behavior for the current user only.

Open the file mentioned above. Find the row saying "load-module
module-udev-detect" and change it to:

load-module module-udev-detect ignore_dB=1"

End Quote.

The problem was gone and the volume scaled correctly. I'm hoping to give the
information needed here so pulseaudio's db can be updated. Here are the details
of the USB audio. Please ask if more information is needed.

$ aplay -l | grep "USB Audio"
card 1: LX3000 [Microsoft LifeChat LX-3000], device 0: USB Audio [USB Audio]

$ lsusb | grep "Microsoft"
Bus 002 Device 011: ID 045e:070f Microsoft Corp.

Alsamixer reports the lowest volume for this device to be -28.37 dB and the
highest to be -0.06 dB.

Thank you in advance.


-- System Information:
Debian Release: wheezy/sid
  APT prefers testing
  APT policy: (990, 'testing'), (750, 'stable'), (700, 'oldstable'), (600, 'unstable'), (550, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 3.2.0-1-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages pulseaudio depends on:
ii  adduser             3.113+nmu1
ii  consolekit          0.4.5-1
ii  libasound2          1.0.25-2
ii  libasound2-plugins  1.0.25-1+b1
ii  libc6               2.13-26
ii  libcap2             1:2.22-1
ii  libdbus-1-3         1.4.18-1
ii  libfftw3-3          3.3-1
ii  libice6             2:1.0.7-2
ii  libltdl7            2.4.2-1
ii  liborc-0.4-0        1:0.4.16-1
ii  libpulse0           1.1-3
ii  libsamplerate0      0.1.8-3
ii  libsm6              2:1.2.0-2
ii  libsndfile1         1.0.25-4
ii  libspeexdsp1        1.2~rc1-3
ii  libtdb1             1.2.9-4+b1
ii  libudev0            175-3.1
ii  libx11-6            2:1.4.4-4
ii  libx11-xcb1         2:1.4.4-4
ii  libxcb1             1.8-2
ii  libxtst6            2:1.2.0-4
ii  lsb-base            3.2-28.1
ii  udev                175-3.1

Versions of packages pulseaudio recommends:
ii  gstreamer0.10-pulseaudio  0.10.31-1
ii  pulseaudio-esound-compat  1.1-3
ii  pulseaudio-module-x11     1.1-3
ii  rtkit                     0.10-2

Versions of packages pulseaudio suggests:
ii  paman             0.9.4-1
ii  paprefs           0.9.9-2
ii  pavucontrol       0.99.2-1
ii  pavumeter         0.9.3-1
ii  pulseaudio-utils  1.1-3

-- no debconf information