Both commands produce underruns at large, audible and visible in the output.
> aplay -D hw:0,0 -v --buffer-time=4000 /tmp/fr025.wav Playing WAVE '/tmp/fr025.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo Hardware PCM card 0 'HDA Intel PCH' device 0 subdevice 0 Its setup is: stream : PLAYBACK access : RW_INTERLEAVED format : S16_LE subformat : STD channels : 2 rate : 44100 exact rate : 44100 (44100/1) msbits : 16 buffer_size : 192 period_size : 32 period_time : 725 tstamp_mode : NONE period_step : 1 avail_min : 32 period_event : 0 start_threshold : 192 stop_threshold : 192 silence_threshold: 0 silence_size : 0 boundary : 6917529027641081856 appl_ptr : 0 hw_ptr : 0 underrun!!! (at least 4.191 ms long) Status: state : XRUN trigger_time: 3336.7694317 tstamp : 3336.11882117 delay : 0 avail : 200 avail_max : 200 underrun!!! (at least 1.832 ms long) Status: state : XRUN trigger_time: 3336.30152303 tstamp : 3336.31983077 delay : 0 avail : 194 avail_max : 194 underrun!!! (at least 0.312 ms long) Status: state : XRUN trigger_time: 3337.6068547 tstamp : 3337.6379149 delay : 0 avail : 200 avail_max : 200 underrun!!! (at least 4.293 ms long) Status: state : XRUN trigger_time: 3339.4484089 tstamp : 3339.8775797 delay : 0 avail : 200 avail_max : 200 underrun!!! (at least 11.592 ms long) Status: state : XRUN trigger_time: 3343.6272217 tstamp : 3343.17862683 delay : 0 avail : 200 avail_max : 200 underrun!!! (at least 2.310 ms long) Status: state : XRUN trigger_time: 3343.700965780 tstamp : 3343.703274524 delay : 0 avail : 200 avail_max : 200 ^CAborted by signal Interrupt... > aplay -D hw:0,0 -v --period-time=2000 --buffer-time=4000 /tmp/fr025.wav Playing WAVE '/tmp/fr025.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo Hardware PCM card 0 'HDA Intel PCH' device 0 subdevice 0 Its setup is: stream : PLAYBACK access : RW_INTERLEAVED format : S16_LE subformat : STD channels : 2 rate : 44100 exact rate : 44100 (44100/1) msbits : 16 buffer_size : 192 period_size : 96 period_time : 2176 tstamp_mode : NONE period_step : 1 avail_min : 96 period_event : 0 start_threshold : 192 stop_threshold : 192 silence_threshold: 0 silence_size : 0 boundary : 6917529027641081856 appl_ptr : 0 hw_ptr : 0 underrun!!! (at least 8.673 ms long) Status: state : XRUN trigger_time: 3355.4367755 tstamp : 3355.13037189 delay : 0 avail : 200 avail_max : 200 underrun!!! (at least 2.189 ms long) Status: state : XRUN trigger_time: 3356.24657841 tstamp : 3356.26845873 delay : 0 avail : 200 avail_max : 200 underrun!!! (at least 2.160 ms long) Status: state : XRUN trigger_time: 3358.690871062 tstamp : 3358.693029225 delay : 0 avail : 281 avail_max : 281 underrun!!! (at least 3.647 ms long) Status: state : XRUN trigger_time: 3360.9384022 tstamp : 3360.13029349 delay : 0 avail : 200 avail_max : 200 underrun!!! (at least 1.095 ms long) Status: state : XRUN trigger_time: 3361.11945732 tstamp : 3361.13039182 delay : 0 avail : 200 avail_max : 200 underrun!!! (at least 3.016 ms long) Status: state : XRUN trigger_time: 3361.132006217 tstamp : 3361.135020659 delay : 0 avail : 200 avail_max : 200 underrun!!! (at least 0.352 ms long) Status: state : XRUN trigger_time: 3361.465478201 tstamp : 3361.465829023 delay : 0 avail : 200 avail_max : 200 underrun!!! (at least 2.799 ms long) Status: state : XRUN trigger_time: 3361.502227029 tstamp : 3361.505024503 delay : 0 avail : 200 avail_max : 200 underrun!!! (at least 0.019 ms long) Status: state : XRUN trigger_time: 3361.513310022 tstamp : 3361.513327710 delay : 0 avail : 200 avail_max : 200 ^CAborted by signal Interrupt... Also, after I do: echo 1 > /proc/asound/card0/pcm0p/xrun_debug I have lots of this in dmesg: [ 3504.140844] ALSA: PCM: [Q] Lost interrupts?: (stream=0, delta=56, new_hw_ptr=809, old_hw_ptr=753) [ 3504.143264] ALSA: PCM: [Q] Lost interrupts?: (stream=0, delta=72, new_hw_ptr=913, old_hw_ptr=841) [ 3504.148353] ALSA: PCM: [Q] Lost interrupts?: (stream=0, delta=72, new_hw_ptr=1137, old_hw_ptr=1065) [ 3504.150102] ALSA: PCM: [Q] Lost interrupts?: (stream=0, delta=80, new_hw_ptr=1217, old_hw_ptr=1137) [ 3504.156337] ALSA: PCM: [Q] Lost interrupts?: (stream=0, delta=72, new_hw_ptr=1489, old_hw_ptr=1417) [ 3504.157990] ALSA: PCM: [Q] Lost interrupts?: (stream=0, delta=72, new_hw_ptr=1561, old_hw_ptr=1489) [ 3504.169408] ALSA: PCM: [Q] Lost interrupts?: (stream=0, delta=72, new_hw_ptr=2065, old_hw_ptr=1993) [ 3504.170967] ALSA: PCM: [Q] Lost interrupts?: (stream=0, delta=72, new_hw_ptr=2137, old_hw_ptr=2065) [ 3504.179684] ALSA: PCM: [Q] Lost interrupts?: (stream=0, delta=72, new_hw_ptr=2521, old_hw_ptr=2449) [ 3504.194902] ALSA: PCM: [Q] Lost interrupts?: (stream=0, delta=80, new_hw_ptr=121, old_hw_ptr=41) -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to pulseaudio in Ubuntu. https://bugs.launchpad.net/bugs/996906 Title: periodic audio skips with Intel HDA Status in PulseAudio sound server: Confirmed Status in pulseaudio package in Ubuntu: Confirmed Bug description: When running PulseAudio, if I'm playing music via any source (Exaile, Totem, Flash in Firefox or Chromium, VLC, etc.) every few minutes the audio will skip once or twice. top doesn't show any process eating CPU any more when it happens. dmesg doesn't show anything. Nothing else seems to be affected. It doesn't seem to happen regularly. I just installed Ubuntu 12.04 from scratch (with pulseaudio 1:1.1-0ubuntu15), but the same thing happened in 10.04 on the same hardware. Uninstalling the PulseAudio packages and going back to ALSA gives me no issues whatsoever, which is how I know the issue is with PulseAudio. I'm using my onboard audio device: $ lspci | grep Audio 00:14.2 Audio device: Advanced Micro Devices [AMD] nee ATI SBx00 Azalia (Intel HDA) Following mailing list instructions, pulseaudio -vvvv --log-time shows during a skip: ( 684.030| 5.000) I: [alsa-sink] alsa-sink.c: Underrun! ( 684.030| 0.000) I: [alsa-sink] alsa-sink.c: Increasing minimal latency to 26.00 ms ( 684.030| 0.000) D: [alsa-sink] alsa-sink.c: Latency set to 26.00ms ( 684.030| 0.000) D: [alsa-sink] alsa-sink.c: hwbuf_unused=60952 ( 684.030| 0.000) D: [alsa-sink] alsa-sink.c: setting avail_min=15944 ( 684.030| 0.000) D: [alsa-sink] alsa-sink.c: Latency set to 26.00ms ( 684.030| 0.000) D: [alsa-sink] alsa-sink.c: hwbuf_unused=60952 ( 684.030| 0.000) D: [alsa-sink] alsa-sink.c: setting avail_min=15944 ( 684.031| 0.000) D: [alsa-sink] protocol-native.c: Underrun on 'ALSA Playback', 0 bytes in queue. ( 684.036| 0.004) D: [alsa-sink] protocol-native.c: Requesting rewind due to end of underrun. ( 684.036| 0.000) D: [alsa-sink] alsa-sink.c: Requested to rewind 10940 bytes. ( 684.036| 0.000) D: [alsa-sink] alsa-sink.c: Limited to 3320 bytes. ( 684.036| 0.000) D: [alsa-sink] alsa-sink.c: before: 830 ( 684.036| 0.000) D: [alsa-sink] alsa-sink.c: after: 830 ( 684.036| 0.000) D: [alsa-sink] alsa-sink.c: Rewound 3320 bytes. ( 684.036| 0.000) D: [alsa-sink] sink.c: Processing rewind... ( 684.036| 0.000) D: [alsa-sink] sink.c: latency = 1337 ( 684.036| 0.000) D: [alsa-sink] sink-input.c: Have to rewind 3320 bytes on render memblockq. ( 684.036| 0.000) D: [alsa-sink] source.c: Processing rewind... ( 696.234| 12.197) I: [alsa-sink] alsa-sink.c: Underrun! ( 696.234| 0.000) I: [alsa-sink] alsa-sink.c: Increasing wakeup watermark to 15.99 ms ( 702.033| 5.799) I: [alsa-sink] alsa-sink.c: Underrun! ( 702.033| 0.000) I: [alsa-sink] alsa-sink.c: Increasing minimal latency to 36.00 ms ( 702.033| 0.000) D: [alsa-sink] alsa-sink.c: Latency set to 36.00ms ( 702.033| 0.000) D: [alsa-sink] alsa-sink.c: hwbuf_unused=59188 ( 702.033| 0.000) D: [alsa-sink] alsa-sink.c: setting avail_min=15680 ( 702.033| 0.000) D: [alsa-sink] alsa-sink.c: Latency set to 36.00ms ( 702.034| 0.000) D: [alsa-sink] alsa-sink.c: hwbuf_unused=59188 ( 702.034| 0.000) D: [alsa-sink] alsa-sink.c: setting avail_min=15680 ( 702.034| 0.000) D: [alsa-sink] protocol-native.c: Underrun on 'ALSA Playback', 0 bytes in queue. ...and it goes on. The "Underrun!" messages alone happened a few times before, but it didn't skip. I'd like to use PulseAudio, but it's pretty annoying having audio skip all the time. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: pulseaudio 1:1.1-0ubuntu15 ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14 Uname: Linux 3.2.0-24-generic x86_64 NonfreeKernelModules: nvidia AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24. ApportVersion: 2.0.1-0ubuntu7 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: toxite 2136 F.... pulseaudio /dev/snd/pcmC0D0p: toxite 2136 F...m pulseaudio Card0.Amixer.info: Card hw:0 'SB'/'HDA ATI SB at 0xfe024000 irq 16' Mixer name : 'Realtek ALC889' Components : 'HDA:10ec0889,1458a102,00100004' Controls : 48 Simple ctrls : 22 Date: Tue May 8 21:45:17 2012 InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425) ProcEnviron: TERM=xterm PATH=(custom, user) LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: pulseaudio UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 12/03/2009 dmi.bios.vendor: Award Software International, Inc. dmi.bios.version: F2 dmi.board.name: GA-790FXTA-UD5 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.:bvrF2:bd12/03/2009:svnGigabyteTechnologyCo.,Ltd.:pnGA-790FXTA-UD5:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-790FXTA-UD5:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr: dmi.product.name: GA-790FXTA-UD5 dmi.sys.vendor: Gigabyte Technology Co., Ltd. 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