Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: pulseaudio (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1594296

Title:
  [USB-Audio - USB Sound Device, playback] Occasional audio playback
  blips from Sweex 7.1 external USB card

Status in pulseaudio package in Ubuntu:
  Confirmed

Bug description:
  When playing audio back (from Chrome), I get occasional blips where it
  sounds like the audio is skipping forwards or backwards.  I've
  followed the instructions at https://wiki.ubuntu.com/PulseAudio/Log to
  configure a debug log and I generally see this in the log when it
  happens:

  ( 765.763|   0.194) I: [alsa-source-ALC269VC Analog] alsa-source.c: Overrun!
  ( 767.600|   1.837) I: [alsa-sink-USB Audio] alsa-sink.c: Scheduling delay of 
361.78 ms > 15.99 ms, you might want to investigate this to improve latency...
  ( 767.600|   0.000) I: [alsa-sink-USB Audio] alsa-sink.c: Increasing minimal 
latency to 36.00 ms
  ( 767.600|   0.000) D: [alsa-sink-USB Audio] alsa-sink.c: Latency set to 
36.00ms
  ( 767.600|   0.000) D: [alsa-sink-USB Audio] alsa-sink.c: hwbuf_unused=1029528
  ( 767.600|   0.000) D: [alsa-sink-USB Audio] alsa-sink.c: setting 
avail_min=86677
  ( 767.600|   0.000) D: [alsa-sink-USB Audio] protocol-native.c: max_request 
changed, trying to update from 8680 to 10444.
  ( 767.600|   0.000) D: [alsa-sink-USB Audio] protocol-native.c: Notifying 
client about increased tlength
  ( 767.600|   0.000) D: [alsa-sink-USB Audio] alsa-sink.c: Latency set to 
36.00ms
  ( 767.600|   0.000) D: [alsa-sink-USB Audio] alsa-sink.c: hwbuf_unused=1029528
  ( 767.600|   0.000) D: [alsa-sink-USB Audio] alsa-sink.c: setting 
avail_min=86677
  ( 767.601|   0.000) D: [alsa-sink-USB Audio] protocol-native.c: Implicit 
underrun of 'Playback'
  ( 767.615|   0.014) D: [alsa-sink-USB Audio] protocol-native.c: Requesting 
rewind due to end of underrun.
  ( 767.615|   0.000) D: [alsa-sink-USB Audio] alsa-sink.c: Requested to rewind 
178188 bytes.
  ( 767.615|   0.000) D: [alsa-sink-USB Audio] alsa-sink.c: Limited to 18788 
bytes.
  ( 767.615|   0.000) D: [alsa-sink-USB Audio] alsa-sink.c: before: 1565
  ( 767.615|   0.000) D: [alsa-sink-USB Audio] alsa-sink.c: after: 1565
  ( 767.615|   0.000) D: [alsa-sink-USB Audio] alsa-sink.c: Rewound 18780 bytes.
  ( 767.615|   0.000) D: [alsa-sink-USB Audio] sink.c: Processing rewind...
  ( 767.615|   0.000) D: [alsa-sink-USB Audio] sink-input.c: Have to rewind 
18780 bytes on render memblockq.
  ( 767.615|   0.000) D: [alsa-sink-USB Audio] source.c: Processing rewind...
  ( 768.855|   1.239) I: [alsa-source-ALC269VC Analog] ratelimit.c: 85 events 
suppressed

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: pulseaudio 1:8.0-0ubuntu3
  ProcVersionSignature: Ubuntu 4.4.0-24.43-generic 4.4.10
  Uname: Linux 4.4.0-24-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Mon Jun 20 10:04:42 2016
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2016-04-27 (53 days ago)
  InstallationMedia: Ubuntu-Server 16.04 LTS "Xenial Xerus" - Release amd64 
(20160420.3)
  SourcePackage: pulseaudio
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:Device successful
  Symptom_Card: CM106 Like Sound Device - USB Sound Device
  Symptom_PulsePlaybackTest: PulseAudio playback test failed
  Symptom_Type: Underruns, dropouts, or "crackling" sound
  Title: [USB-Audio - USB Sound Device, playback] Underruns, dropouts or 
crackling sound
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/19/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: F5
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: MMLP7AP-00
  dmi.board.vendor: GIGABYTE
  dmi.board.version: 1.x
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 10
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrF5:bd02/19/2014:svnGIGABYTE:pnMMLP7AP-00:pvr1.x:rvnGIGABYTE:rnMMLP7AP-00:rvr1.x:cvnToBeFilledByO.E.M.:ct10:cvrToBeFilledByO.E.M.:
  dmi.product.name: MMLP7AP-00
  dmi.product.version: 1.x
  dmi.sys.vendor: GIGABYTE

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