Public bug reported:

It sometimes happens, just like now, that I am unable to play any
youtube or local file - when I click play, the progress bar does not
move and there is no sound. I have to unplug and plug in the USB cable
of the Saffire one time or several times to make it work again.

It happened again and the report was made at that moment.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 5.8.0-59.66~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-59-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC2:  michal     1327 F.... pulseaudio
 /dev/snd/pcmC2D0p:   michal    52842 F...m speaker-test
 /dev/snd/controlC0:  michal     1327 F.... pulseaudio
 /dev/snd/controlC1:  michal     1327 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Sat Jul 17 18:49:15 2021
InstallationDate: Installed on 2021-06-16 (30 days ago)
InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 
(20210209.1)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:USB failed
Symptom_AlsaPlaybackTestStderr: F a i l u r e   t o   r e s u m e :   I n v a l 
i d   a r g u m e n t
Symptom_Card: Saffire 6 - Saffire 6 USB
Symptom_Type: No sound at all
Title: [USB-Audio - Saffire 6 USB, playback] No sound at all
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/25/2019
dmi.bios.release: 5.13
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1.80
dmi.board.asset.tag: Default string
dmi.board.name: Z390-A PRO (MS-7B98)
dmi.board.vendor: Micro-Star International Co., Ltd.
dmi.board.version: 1.0
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Micro-Star International Co., Ltd.
dmi.chassis.version: 1.0
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr1.80:bd12/25/2019:br5.13:svnMicro-StarInternationalCo.,Ltd.:pnMS-7B98:pvr1.0:rvnMicro-StarInternationalCo.,Ltd.:rnZ390-APRO(MS-7B98):rvr1.0:cvnMicro-StarInternationalCo.,Ltd.:ct3:cvr1.0:
dmi.product.family: Default string
dmi.product.name: MS-7B98
dmi.product.sku: Default string
dmi.product.version: 1.0
dmi.sys.vendor: Micro-Star International Co., Ltd.

** Affects: ubuntu
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

** Description changed:

  It sometimes happens, just like now, that I am unable to play any
  youtube or local file - when I click play, the progress bar does not
  move and there is no sound. I have to unplug and plug in the USB cable
  of the Saffire one time or several times to make it work again.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu5
  ProcVersionSignature: Ubuntu 5.8.0-59.66~20.04.1-generic 5.8.18
  Uname: Linux 5.8.0-59-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu27.18
  Architecture: amd64
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC2:  michal     1327 F.... pulseaudio
-  /dev/snd/pcmC2D0p:   michal    52842 F...m speaker-test
-  /dev/snd/controlC0:  michal     1327 F.... pulseaudio
-  /dev/snd/controlC1:  michal     1327 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC2:  michal     1327 F.... pulseaudio
+  /dev/snd/pcmC2D0p:   michal    52842 F...m speaker-test
+  /dev/snd/controlC0:  michal     1327 F.... pulseaudio
+  /dev/snd/controlC1:  michal     1327 F.... pulseaudio
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Jul 17 18:49:15 2021
  InstallationDate: Installed on 2021-06-16 (30 days ago)
  InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 
(20210209.1)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:USB failed
  Symptom_AlsaPlaybackTestStderr: F a i l u r e   t o   r e s u m e :   I n v a 
l i d   a r g u m e n t
  Symptom_Card: Saffire 6 - Saffire 6 USB
  Symptom_Type: No sound at all
  Title: [USB-Audio - Saffire 6 USB, playback] No sound at all
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/25/2019
  dmi.bios.release: 5.13
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1.80
  dmi.board.asset.tag: Default string
  dmi.board.name: Z390-A PRO (MS-7B98)
  dmi.board.vendor: Micro-Star International Co., Ltd.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 3
  dmi.chassis.vendor: Micro-Star International Co., Ltd.
  dmi.chassis.version: 1.0
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr1.80:bd12/25/2019:br5.13:svnMicro-StarInternationalCo.,Ltd.:pnMS-7B98:pvr1.0:rvnMicro-StarInternationalCo.,Ltd.:rnZ390-APRO(MS-7B98):rvr1.0:cvnMicro-StarInternationalCo.,Ltd.:ct3:cvr1.0:
  dmi.product.family: Default string
  dmi.product.name: MS-7B98
  dmi.product.sku: Default string
  dmi.product.version: 1.0
  dmi.sys.vendor: Micro-Star International Co., Ltd.

** Description changed:

  It sometimes happens, just like now, that I am unable to play any
  youtube or local file - when I click play, the progress bar does not
  move and there is no sound. I have to unplug and plug in the USB cable
  of the Saffire one time or several times to make it work again.
+ 
+ It happened again and the report was made at that moment.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu5
  ProcVersionSignature: Ubuntu 5.8.0-59.66~20.04.1-generic 5.8.18
  Uname: Linux 5.8.0-59-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu27.18
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  michal     1327 F.... pulseaudio
   /dev/snd/pcmC2D0p:   michal    52842 F...m speaker-test
   /dev/snd/controlC0:  michal     1327 F.... pulseaudio
   /dev/snd/controlC1:  michal     1327 F.... pulseaudio
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Jul 17 18:49:15 2021
  InstallationDate: Installed on 2021-06-16 (30 days ago)
  InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 
(20210209.1)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:USB failed
  Symptom_AlsaPlaybackTestStderr: F a i l u r e   t o   r e s u m e :   I n v a 
l i d   a r g u m e n t
  Symptom_Card: Saffire 6 - Saffire 6 USB
  Symptom_Type: No sound at all
  Title: [USB-Audio - Saffire 6 USB, playback] No sound at all
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/25/2019
  dmi.bios.release: 5.13
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1.80
  dmi.board.asset.tag: Default string
  dmi.board.name: Z390-A PRO (MS-7B98)
  dmi.board.vendor: Micro-Star International Co., Ltd.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 3
  dmi.chassis.vendor: Micro-Star International Co., Ltd.
  dmi.chassis.version: 1.0
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr1.80:bd12/25/2019:br5.13:svnMicro-StarInternationalCo.,Ltd.:pnMS-7B98:pvr1.0:rvnMicro-StarInternationalCo.,Ltd.:rnZ390-APRO(MS-7B98):rvr1.0:cvnMicro-StarInternationalCo.,Ltd.:ct3:cvr1.0:
  dmi.product.family: Default string
  dmi.product.name: MS-7B98
  dmi.product.sku: Default string
  dmi.product.version: 1.0
  dmi.sys.vendor: Micro-Star International Co., Ltd.

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https://bugs.launchpad.net/bugs/1936721

Title:
  [USB-Audio - Saffire 6 USB, playback] No sound at all - unable to play
  any audio, but it works after unplugging and plugging in the device

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