This bug affects me with a PCM2706C bare DAC (USB Soundcard standalone
board).  I use 2 other very similar external USB DAC's (Different
chipsets) and the volume control works fine with them.  Also verified on
a laptop.  Both Laptop and Desktop are running 18.04.4.4

At anything above silent, I get full volume.  The volume for the
specific source (application) can be adjusted under the Playback tab
(software (ALSA) volume).

This is particularly obnoxious since each new sound begins playback at
full volume.

I believe this is a kernel bug for this particular USB DAC.

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https://bugs.launchpad.net/bugs/737617

Title:
  [USB-Audio - USB Audio DAC] FiiO E7/TI Burr-Brown: Volume control does
  not work

Status in alsa-driver package in Ubuntu:
  Expired

Bug description:
  The volume control for the FiiO E7 USB sound card doesn't work. Tested
  with the normal gnome volume control and in alsamixer. 0% mutes the
  audio, everything larger than 0% is full volume. Alsamixer only shows
  one control, labeled "PCM". The chipset is a TI Burr-Brown PCM2706.
  Might be related to #559939 (different chipset, though).

  ProblemType: Bug
  DistroRelease: Ubuntu 10.10
  Package: alsa-base 1.0.23+dfsg-1ubuntu4
  ProcVersionSignature: Ubuntu 2.6.35-28.49-generic 2.6.35.11
  Uname: Linux 2.6.35-28-generic x86_64
  NonfreeKernelModules: nvidia
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  moritz     2265 F.... pulseaudio
   /dev/snd/pcmC1D0p:   moritz     2265 F...m pulseaudio
   /dev/snd/controlC0:  moritz     2265 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xfbff4000 irq 51'
     Mixer name : 'Realtek ALC892'
     Components : 'HDA:10ec0892,1458a002,00100302'
     Controls      : 34
     Simple ctrls  : 18
  Card1.Amixer.info:
   Card hw:1 'default'/'Burr-Brown from TI               USB Audio DAC    at 
usb-0000:00:1a.1-1, full s'
     Mixer name : 'USB Mixer'
     Components : 'USB08bb:2706'
     Controls      : 2
     Simple ctrls  : 1
  Card2.Amixer.info:
   Card hw:2 'NVidia'/'HDA NVidia at 0xf9ffc000 irq 17'
     Mixer name : 'Nvidia GPU 12 HDMI/DP'
     Components : 'HDA:10de0012,10de0101,00100100'
     Controls      : 16
     Simple ctrls  : 4
  Date: Fri Mar 18 15:28:48 2011
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Beta amd64 (20100901.1)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en
   PATH=(custom, user)
   LANG=en_US.UTF-8
   LC_MESSAGES=en_GB.UTF-8
   SHELL=/bin/bash
  SelectedCard: 1 default USB-Audio - USB Audio DAC
  SourcePackage: alsa-driver
  Symptom: audio
  Title: [USB-Audio - USB Audio DAC   ] Playback problem
  dmi.bios.date: 08/20/2010
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F5
  dmi.board.name: H55N-USB3
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: 
dmi:bvnAwardSoftwareInternational,Inc.:bvrF5:bd08/20/2010:svnGigabyteTechnologyCo.,Ltd.:pnH55N-USB3:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnH55N-USB3:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: H55N-USB3
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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