Public bug reported:

After playing sound for a while (minutes, not seconds), the right
channel will become attenuated.

Restoring balance can be done by unplugging the headphones (from the
built-in sound card) or disconnecting the external DAC and reconnecting
it.

Balance can be restored by altering balance in pavucontrol, but if you
balance by increasing the right side volume, it introduces a lot of
distortion.

Same behavior observed using both the internal sound device as well as
the Sound Blaster USB sound device, so it's in the mixing software
somewhere.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 5.4.0-47.51-generic 5.4.55
Uname: Linux 5.4.0-47-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.8
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Thu Sep 17 14:33:43 2020
InstallationDate: Installed on 2020-07-10 (69 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: alsa-driver
Symptom: audio
Symptom_Card: SoundBlaster MP3+ - Sound Blaster MP3+
Symptom_PulseAudioLog:
 Sep 15 15:45:31 vmhost01 dbus-daemon[1765]: [system] Activating via systemd: 
service name='org.freedesktop.RealtimeKit1' unit='rtkit-daemon.service' 
requested by ':1.29' (uid=125 pid=2024 comm="/usr/bin/pulseaudio --daemonize=no 
--log-target=jo" label="unconfined")
 Sep 15 15:45:32 vmhost01 pulseaudio[2024]: No UCM verb is valid for hw:0
 Sep 15 15:45:33 vmhost01 pulseaudio[2024]: No UCM verb is valid for hw:2
 Sep 15 15:45:34 vmhost01 dbus-daemon[1765]: [system] Activating via systemd: 
service name='org.bluez' unit='dbus-org.bluez.service' requested by ':1.45' 
(uid=125 pid=2024 comm="/usr/bin/pulseaudio --daemonize=no --log-target=jo" 
label="unconfined")
 Sep 15 19:01:54 vmhost01 dbus-daemon[1765]: [system] Activating via systemd: 
service name='org.bluez' unit='dbus-org.bluez.service' requested by ':1.114' 
(uid=1000 pid=4820 comm="/usr/bin/pulseaudio --daemonize=no --log-target=jo" 
label="unconfined")
Symptom_Type: Sound works for a while, then breaks
Title: [USB-Audio - Sound Blaster MP3+, playback] fails after a while
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/16/2019
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2901
dmi.board.asset.tag: Default string
dmi.board.name: ROG STRIX B450-F GAMING
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr2901:bd10/16/2019:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnROGSTRIXB450-FGAMING:rvrRev1.xx:cvnDefaultstring:ct3:cvrDefaultstring:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: System Product Name
dmi.product.sku: SKU
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer

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


** Tags: amd64 apport-bug focal

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Touch seeded packages, which is subscribed to alsa-driver in Ubuntu.
https://bugs.launchpad.net/bugs/1896133

Title:
  [Audio Playback] right channel attenuated after random length of time

Status in alsa-driver package in Ubuntu:
  New

Bug description:
  After playing sound for a while (minutes, not seconds), the right
  channel will become attenuated.

  Restoring balance can be done by unplugging the headphones (from the
  built-in sound card) or disconnecting the external DAC and
  reconnecting it.

  Balance can be restored by altering balance in pavucontrol, but if you
  balance by increasing the right side volume, it introduces a lot of
  distortion.

  Same behavior observed using both the internal sound device as well as
  the Sound Blaster USB sound device, so it's in the mixing software
  somewhere.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu5
  ProcVersionSignature: Ubuntu 5.4.0-47.51-generic 5.4.55
  Uname: Linux 5.4.0-47-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu27.8
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Sep 17 14:33:43 2020
  InstallationDate: Installed on 2020-07-10 (69 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  PackageArchitecture: all
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_Card: SoundBlaster MP3+ - Sound Blaster MP3+
  Symptom_PulseAudioLog:
   Sep 15 15:45:31 vmhost01 dbus-daemon[1765]: [system] Activating via systemd: 
service name='org.freedesktop.RealtimeKit1' unit='rtkit-daemon.service' 
requested by ':1.29' (uid=125 pid=2024 comm="/usr/bin/pulseaudio --daemonize=no 
--log-target=jo" label="unconfined")
   Sep 15 15:45:32 vmhost01 pulseaudio[2024]: No UCM verb is valid for hw:0
   Sep 15 15:45:33 vmhost01 pulseaudio[2024]: No UCM verb is valid for hw:2
   Sep 15 15:45:34 vmhost01 dbus-daemon[1765]: [system] Activating via systemd: 
service name='org.bluez' unit='dbus-org.bluez.service' requested by ':1.45' 
(uid=125 pid=2024 comm="/usr/bin/pulseaudio --daemonize=no --log-target=jo" 
label="unconfined")
   Sep 15 19:01:54 vmhost01 dbus-daemon[1765]: [system] Activating via systemd: 
service name='org.bluez' unit='dbus-org.bluez.service' requested by ':1.114' 
(uid=1000 pid=4820 comm="/usr/bin/pulseaudio --daemonize=no --log-target=jo" 
label="unconfined")
  Symptom_Type: Sound works for a while, then breaks
  Title: [USB-Audio - Sound Blaster MP3+, playback] fails after a while
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/16/2019
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2901
  dmi.board.asset.tag: Default string
  dmi.board.name: ROG STRIX B450-F GAMING
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 3
  dmi.chassis.vendor: Default string
  dmi.chassis.version: Default string
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr2901:bd10/16/2019:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnROGSTRIXB450-FGAMING:rvrRev1.xx:cvnDefaultstring:ct3:cvrDefaultstring:
  dmi.product.family: To be filled by O.E.M.
  dmi.product.name: System Product Name
  dmi.product.sku: SKU
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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