[pulseaudio-tickets] [Bug 46236] 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

--- Comment #17 from Raymond <superquad.vortex2 at gmail.com> ---
USB Audio 1.0 Specification

5.2.2.2.3
Mixer Control
A Mixer Unit consists of a number of Mixer Controls, either programmable or
fixed. A Mixer Control can support all possible Control attributes (CUR, MIN,
MAX, and RES). The settings for the CUR, MIN, and MAX attributes can range from
+127.9961 dB (0x7FFF) down to -127.9961 dB (0x8001) in steps of 1/256
dB or 0.00390625 dB (0x0001). The range for the CUR attribute is extended by
code 0x8000, representing silence, i.e., -∞ dB. The settings for the RES
attribute can only take positive values and range from 1/256 dB (0x0001) to
+127.9961 dB (0x7FFF).

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