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 Desktop 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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