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
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https://bugs.launchpad.net/bugs/1539967
Title:
Audio skips (buffer underruns) intermittently but particularly when
screen blanks
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