Public bug reported:

I want to split the 4.0 output into 2x2.0 outputs. This is my config for
/etc/pulse/default.pa

load-module module-remap-sink sink_name=behringera 
sink_properties="device.description='Behringer Output A (1 and 2)'" remix=no 
master=alsa_output.usb-BEHRINGER_UMC204HD_192k-00.analog-surround-40 channels=2 
master_channel_map=front-left,front-right channel_map=left,right
load-module module-remap-sink sink_name=behringerb 
sink_properties="device.description='Behringer Output B (3 and 4)'" remix=no 
master=alsa_output.usb-BEHRINGER_UMC204HD_192k-00.analog-surround-40 channels=2 
master_channel_map=rear-left,rear-right channel_map=left,right

I have tested this config on Ubuntu 18.04, Debian, Fedora 30, it works
on all of them. But does not work on Ubuntu 20.04, nor Fedora 32. Both
20.04 and f32 use version 13.99.1 of Pulseaudio, so I suspect the
problem to be with this version.

When I speak about A and B, I am referring to the device description
given in the 2 lines above, line 1 being A and line 2 being B.

What is happening on 20.04 and f32 is if I comment out A, then B will
work. If I comment out B, A will work, but both A and B are defined,
then only A will work. If B is defined first, and then A, something else
weird happens where A will work, but is sent out through B, and B will
work as expected.

A discussion on Reddit, another user has version 13.0 on NixOS and his
similar UMC404HD works fine. Here is a link to the info on Reddit:
https://www.reddit.com/r/linuxaudio/comments/fqmhbe/pulseaudio_and_multichannel_interfaces/ftkq7ov

I know this is probably a pulseaudio bug, but I could not figure out how
to submit a bug report to them.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
Uname: Linux 5.4.0-26-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27.2
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  angus      5429 F.... pulseaudio
 /dev/snd/pcmC0D0p:   angus      5429 F...m pulseaudio
 /dev/snd/controlC3:  angus      5429 F.... pulseaudio
 /dev/snd/controlC2:  angus      5429 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Mon Jun 15 23:14:49 2020
InstallationDate: Installed on 2020-04-25 (51 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:U192k successful
Symptom_Card: Family 17h (Models 00h-0fh) HD Audio Controller - HD-Audio Generic
Symptom_PulsePlaybackTest: PulseAudio playback test successful
Symptom_Type: None of the above
Title: [USB-Audio - UMC204HD 192k, playback] Playback problem
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/21/2019
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1.H0
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: X370 KRAIT GAMING (MS-7A33)
dmi.board.vendor: Micro-Star International Co., Ltd.
dmi.board.version: 1.0
dmi.chassis.asset.tag: To be filled by O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: Micro-Star International Co., Ltd.
dmi.chassis.version: 1.0
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr1.H0:bd01/21/2019:svnMicro-StarInternationalCo.,Ltd.:pnMS-7A33:pvr1.0:rvnMicro-StarInternationalCo.,Ltd.:rnX370KRAITGAMING(MS-7A33):rvr1.0:cvnMicro-StarInternationalCo.,Ltd.:ct3:cvr1.0:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: MS-7A33
dmi.product.sku: To be filled by O.E.M.
dmi.product.version: 1.0
dmi.sys.vendor: Micro-Star International Co., Ltd.

** Affects: alsa-driver (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to alsa-driver in Ubuntu.
https://bugs.launchpad.net/bugs/1883608

Title:
  [USB-Audio - UMC204HD 192k, playback] Playback problem

Status in alsa-driver package in Ubuntu:
  New

Bug description:
  I want to split the 4.0 output into 2x2.0 outputs. This is my config
  for /etc/pulse/default.pa

  load-module module-remap-sink sink_name=behringera 
sink_properties="device.description='Behringer Output A (1 and 2)'" remix=no 
master=alsa_output.usb-BEHRINGER_UMC204HD_192k-00.analog-surround-40 channels=2 
master_channel_map=front-left,front-right channel_map=left,right
  load-module module-remap-sink sink_name=behringerb 
sink_properties="device.description='Behringer Output B (3 and 4)'" remix=no 
master=alsa_output.usb-BEHRINGER_UMC204HD_192k-00.analog-surround-40 channels=2 
master_channel_map=rear-left,rear-right channel_map=left,right

  I have tested this config on Ubuntu 18.04, Debian, Fedora 30, it works
  on all of them. But does not work on Ubuntu 20.04, nor Fedora 32. Both
  20.04 and f32 use version 13.99.1 of Pulseaudio, so I suspect the
  problem to be with this version.

  When I speak about A and B, I am referring to the device description
  given in the 2 lines above, line 1 being A and line 2 being B.

  What is happening on 20.04 and f32 is if I comment out A, then B will
  work. If I comment out B, A will work, but both A and B are defined,
  then only A will work. If B is defined first, and then A, something
  else weird happens where A will work, but is sent out through B, and B
  will work as expected.

  A discussion on Reddit, another user has version 13.0 on NixOS and his
  similar UMC404HD works fine. Here is a link to the info on Reddit:
  
https://www.reddit.com/r/linuxaudio/comments/fqmhbe/pulseaudio_and_multichannel_interfaces/ftkq7ov

  I know this is probably a pulseaudio bug, but I could not figure out
  how to submit a bug report to them.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu5
  ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
  Uname: Linux 5.4.0-26-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu27.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  angus      5429 F.... pulseaudio
   /dev/snd/pcmC0D0p:   angus      5429 F...m pulseaudio
   /dev/snd/controlC3:  angus      5429 F.... pulseaudio
   /dev/snd/controlC2:  angus      5429 F.... pulseaudio
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Jun 15 23:14:49 2020
  InstallationDate: Installed on 2020-04-25 (51 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:U192k successful
  Symptom_Card: Family 17h (Models 00h-0fh) HD Audio Controller - HD-Audio 
Generic
  Symptom_PulsePlaybackTest: PulseAudio playback test successful
  Symptom_Type: None of the above
  Title: [USB-Audio - UMC204HD 192k, playback] Playback problem
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/21/2019
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1.H0
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: X370 KRAIT GAMING (MS-7A33)
  dmi.board.vendor: Micro-Star International Co., Ltd.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: To be filled by O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Micro-Star International Co., Ltd.
  dmi.chassis.version: 1.0
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr1.H0:bd01/21/2019:svnMicro-StarInternationalCo.,Ltd.:pnMS-7A33:pvr1.0:rvnMicro-StarInternationalCo.,Ltd.:rnX370KRAITGAMING(MS-7A33):rvr1.0:cvnMicro-StarInternationalCo.,Ltd.:ct3:cvr1.0:
  dmi.product.family: To be filled by O.E.M.
  dmi.product.name: MS-7A33
  dmi.product.sku: To be filled by O.E.M.
  dmi.product.version: 1.0
  dmi.sys.vendor: Micro-Star International Co., Ltd.

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