You probably want to send this to the ALSA developer list, this one is
not very active.
On Mon, Dec 31, 2018 at 09:05:59PM -0800, Robert M. Riches Jr. wrote:
With a new OS installation on a pre-existing machine, some of the
USB audio devices now have only 1.00 dB of playback volume
adjustment, which of course is not enough to be terribly useful.
The affected USB devices show up as "Audio Advantage MicroII" in the
output of "aplay -L". From LSB, they show up as these:
Bus 001 Device 004: ID 0d8c:0103 C-Media Electronics, Inc. CM102-A+/102S+ Audio Controller
Bus 001 Device 003: ID 0d8c:0103 C-Media Electronics, Inc. CM102-A+/102S+ Audio Controller
I just installed Devuan Ascii on the machine. It's running kernel
4.9.0-8-amd64 and alsa-utils version 1.1.3-1. Doing "amixer -c 1
contents" or "amixer -c 2 contents" shows this for playback volume:
numid=3,iface=MIXER,name='PCM Playback Volume'
; type=INTEGER,access=rw---R--,values=2,min=0,max=255,step=0
: values=0,0
| dBminmax-min=-1.00dB,max=0.00dB
and
numid=3,iface=MIXER,name='PCM Playback Volume'
; type=INTEGER,access=rw---R--,values=2,min=0,max=255,step=0
: values=77,77
| dBminmax-min=-1.00dB,max=0.00dB
Using alsamixer to run the controls from end to end, I cannot
perceive any difference in volume level.
In contrast, the other device I use (either HDA Intel or HDA NVidia)
has around a 60dB range according to amixer, and running the control
in alsamixer from end to end has a huge range of gain.
Previously, the exact same hardware was running Debian 7/Wheezy and
then Slackware 14.2. With both those operating systems, the USB
sound devices had a very adequate volume control range, certainly a
whole lot more than 1dB.
Being as the USB sound devices are the ones my wife uses, I'd be
extremely grateful if somebody could point me a to way (if one
exists) to a usefully greater range of volume control. Any
suggestions?
Thanks,
Robert
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