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[Bug 1539967] [NEW] Audio skips (buffer underruns) intermittently but particularly when screen blanks

To: touch-packages@xxxxxxxxxxxxxxxxxxx
From: Francis Chin <me@xxxxxxxxx>
Date: Sat, 30 Jan 2016 18:39:54 -0000
Reply-to: Bug 1539967 <1539967@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Public bug reported:

Audio playback via ALSA (snd_intel_hda) & pulseaudio inevitably 'skips'
(repeats buffer content) intermittently a few times each hour, and
severely whenever the screen is blanked for inactivity.

CPU load is low (mostly idle).

I didn't have this problem with my previous fresh installation of Ubuntu
(14.04.3 LTS) on this hardware.

>From dmesg, kernel appears to be using the TSC clocksource:
[ 3.180127] clocksource: Switched to clocksource tsc

Upon startup, Pulseaudio sees high resolution timers:
I: [pulseaudio] main.c: Fresh high-resolution timers available! Bon appetit!

When audio skips, alsa-sink.c logs a massive scheduling delay (e.g.
1070.00 ms > 15.99 ms) and also that "snd_pcm_avail() returned a value
that is exceptionally large: 623124 bytes (1177 ms)"

Currently running Ubuntu 15.10 Wily (fresh install).
linux-sound-base:
  Installed: 1.0.25+dfsg-0ubuntu5
pulseaudio:
Installed: 1:6.0-0ubuntu13

Audio output used is Built-in Audio Analogue Surround 5.1 (motherboard
audio, Realtek ALC889A)

Attaching log from pulseaudio -vvvv

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 4.2.0-25.30-generic 4.2.6
Uname: Linux 4.2.0-25-generic x86_64
NonfreeKernelModules: zfs zunicode zcommon znvpair zavl fglrx
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/pcmC0D0p:   chinf      7928 F...m pulseaudio
 /dev/snd/controlC0:  chinf      7928 F.... pulseaudio
 /dev/snd/controlC1:  chinf      7928 F.... pulseaudio
CurrentDesktop: Unity
Date: Sat Jan 30 18:17:01 2016
EcryptfsInUse: Yes
InstallationDate: Installed on 2015-12-11 (50 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_Card: Built-in Audio - HDA ATI SB
Symptom_Jack: Green Line Out, Rear
Symptom_Type: Sound works for a while, then breaks
Title: [GA-MA790GP-DS4H, Realtek ALC889A, Green Line Out, Rear] fails after a while
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/16/2009
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: F6
dmi.board.name: GA-MA790GP-DS4H
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF6:bd09/16/2009:svnGigabyteTechnologyCo.,Ltd.:pnGA-MA790GP-DS4H:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-MA790GP-DS4H:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: GA-MA790GP-DS4H
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
mtime.conffile..etc.modprobe.d.alsa.base.conf: 2016-01-12T14:13:00.166647

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


** Tags: amd64 apport-bug wily

** Attachment added: "pulseaudio_debug2_audio-skipping_dpms.log"
   https://bugs.launchpad.net/bugs/1539967/+attachment/4560046/+files/pulseaudio_debug2_audio-skipping_dpms.log

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to alsa-driver in Ubuntu.
https://bugs.launchpad.net/bugs/1539967

Title:
  Audio skips (buffer underruns) intermittently but particularly when
  screen blanks

Status in alsa-driver package in Ubuntu:
  New

Bug description:
  Audio playback via ALSA (snd_intel_hda) & pulseaudio inevitably
  'skips' (repeats buffer content) intermittently a few times each hour,
  and severely whenever the screen is blanked for inactivity.

  CPU load is low (mostly idle).

  I didn't have this problem with my previous fresh installation of
  Ubuntu (14.04.3 LTS) on this hardware.

  From dmesg, kernel appears to be using the TSC clocksource:
  [ 3.180127] clocksource: Switched to clocksource tsc

  Upon startup, Pulseaudio sees high resolution timers:
  I: [pulseaudio] main.c: Fresh high-resolution timers available! Bon appetit!

  When audio skips, alsa-sink.c logs a massive scheduling delay (e.g.
  1070.00 ms > 15.99 ms) and also that "snd_pcm_avail() returned a value
  that is exceptionally large: 623124 bytes (1177 ms)"

  Currently running Ubuntu 15.10 Wily (fresh install).
  linux-sound-base:
    Installed: 1.0.25+dfsg-0ubuntu5
  pulseaudio:
  Installed: 1:6.0-0ubuntu13

  Audio output used is Built-in Audio Analogue Surround 5.1 (motherboard
  audio, Realtek ALC889A)

  Attaching log from pulseaudio -vvvv

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: alsa-base 1.0.25+dfsg-0ubuntu5
  ProcVersionSignature: Ubuntu 4.2.0-25.30-generic 4.2.6
  Uname: Linux 4.2.0-25-generic x86_64
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl fglrx
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/pcmC0D0p:   chinf      7928 F...m pulseaudio
   /dev/snd/controlC0:  chinf      7928 F.... pulseaudio
   /dev/snd/controlC1:  chinf      7928 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sat Jan 30 18:17:01 2016
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-12-11 (50 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_Card: Built-in Audio - HDA ATI SB
  Symptom_Jack: Green Line Out, Rear
  Symptom_Type: Sound works for a while, then breaks
  Title: [GA-MA790GP-DS4H, Realtek ALC889A, Green Line Out, Rear] fails after a while
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/16/2009
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F6
  dmi.board.name: GA-MA790GP-DS4H
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF6:bd09/16/2009:svnGigabyteTechnologyCo.,Ltd.:pnGA-MA790GP-DS4H:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-MA790GP-DS4H:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: GA-MA790GP-DS4H
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.
  mtime.conffile..etc.modprobe.d.alsa.base.conf: 2016-01-12T14:13:00.166647

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Follow ups

[Bug 1539967] Re: Audio skips (buffer underruns) intermittently but particularly when screen blanks
From: Raymond, 2016-01-30