Public bug reported:
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
** Affects: pulseaudio (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug xenial
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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
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