[pulseaudio-tickets] [Bug 46236] New: Microsoft LifeChat LX-3000 USB Audio Headset DB issue with Volume Scale

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=46236

             Bug #: 46236
           Summary: Microsoft LifeChat LX-3000 USB Audio Headset DB issue
                    with Volume Scale
    Classification: Unclassified
           Product: PulseAudio
           Version: unspecified
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: minor
          Priority: medium
         Component: modules
        AssignedTo: pulseaudio-bugs at lists.freedesktop.org
        ReportedBy: kitatake at gmail.com
         QAContact: pulseaudio-bugs at lists.freedesktop.org
                CC: lennart at poettering.net


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.

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