Yeah, I see lots of these during the stutters:

D: [alsa-sink] sink-input.c: Requesting rewind due to corking
D: [alsa-sink] alsa-sink.c: Requested to rewind 14112 bytes.
D: [alsa-sink] alsa-sink.c: Limited to 13856 bytes.
D: [alsa-sink] alsa-sink.c: before: 3464
D: [alsa-sink] alsa-sink.c: after: 2552
D: [alsa-sink] alsa-sink.c: Rewound 10208 bytes.
D: [alsa-sink] sink.c: Processing rewind...
D: [alsa-sink] sink.c: latency = 22157
D: [alsa-sink] sink-input.c: Have to rewind 10208 bytes on render memblockq.
D: [alsa-sink] sink-input.c: Have to rewind 10208 bytes on render memblockq.
D: [alsa-sink] sink-input.c: Have to rewind 10208 bytes on implementor.
D: [alsa-sink] source.c: Processing rewind...
D: [alsa-sink] alsa-sink.c: Requested volume: 0:  40% 1:  40%
D: [alsa-sink] alsa-sink.c:            in dB: 0: -24,20 dB 1: -24,20 dB
D: [alsa-sink] alsa-sink.c: Got hardware volume: 0:  40% 1:  40%
D: [alsa-sink] alsa-sink.c:               in dB: 0: -24,00 dB 1: -24,00 dB
D: [alsa-sink] alsa-sink.c: Calculated software volume: 0:  99% 1:  99% 
(accurate-enough=yes)
D: [alsa-sink] alsa-sink.c:                      in dB: 0: -0,20 dB 1: -0,20 dB
D: [alsa-sink] sink.c: Volume not changing
D: [alsa-sink] alsa-sink.c: Requested to rewind 14112 bytes.
D: [alsa-sink] alsa-sink.c: Limited to 13696 bytes.
D: [alsa-sink] alsa-sink.c: before: 3424
D: [alsa-sink] alsa-sink.c: after: 2512
D: [alsa-sink] alsa-sink.c: Rewound 10048 bytes.
D: [alsa-sink] sink.c: Processing rewind...
D: [alsa-sink] sink.c: latency = 22274
D: [alsa-sink] sink-input.c: Have to rewind 10048 bytes on render memblockq.
D: [alsa-sink] source.c: Processing rewind...

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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/1045771

Title:
  Underruns and stuttering

Status in “pulseaudio” package in Ubuntu:
  Confirmed

Bug description:
  When playing sound, be it in Clementine, in games via wine or in
  movies, I get stuttering. Attached is an example of log from
  clementine, running under pulseaudio -vvv

  Here's all the relevant info I can think of:

  
  lspci | grep Audio :
  00:1b.0 Audio device: Intel Corporation Panther Point High Definition Audio 
Controller (rev 04)
  01:00.1 Audio device: Advanced Micro Devices [AMD] nee ATI Turks HDMI Audio 
[Radeon HD 6000 Series]

  alsamixer :
  Chip: Realtek ALC269VC, Card: HDA Intel PCH

  I'm using an up-to-date Precise. Let me know if you need more info.

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