[pulseaudio-tickets] [Bug 49608] New: periodic audio skips with Intel HDA

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=49608

             Bug #: 49608
           Summary: periodic audio skips with Intel HDA
    Classification: Unclassified
           Product: PulseAudio
           Version: unspecified
          Platform: All
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: core
        AssignedTo: pulseaudio-bugs at lists.freedesktop.org
        ReportedBy: accounts at chazomatic.us
         QAContact: pulseaudio-bugs at lists.freedesktop.org
                CC: lennart at poettering.net


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.

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