Booted in the raring PC with the audio issues. dmesg output before
reproducing the issue has the following line that looks suspicious to
me:

[13828.248950] hrtimer: interrupt took 15288 ns

When started pulseaudio with the -vvvv option dmesg showed (did not open
any audio program yet):

[27622.091908] hda-intel 0000:00:1b.0: Unstable LPIB (65536 >= 8192);
disabling LPIB delay counting

After reproducing the issue by using mumble, dmesg shows *nothing* new.
At this stage, top shows:

nessita@dali:~$ top

top - 15:50:13 up  7:45,  8 users,  load average: 0.14, 0.22, 0.23
Tasks: 289 total,   3 running, 284 sleeping,   0 stopped,   2 zombie
%Cpu(s):  2.0 us,  1.6 sy,  0.0 ni, 95.9 id,  0.0 wa,  0.0 hi,  0.5 si,  0.0 st
KiB Mem:   8167864 total,  3780108 used,  4387756 free,   377504 buffers
KiB Swap:  6290428 total,        0 used,  6290428 free,   866680 cached

  PID USER      PR  NI  VIRT  RES  SHR S  %CPU %MEM    TIME+  COMMAND           
                                        
11852 nessita   20   0 1461m  55m  32m S   5.3  0.7   0:13.38 mumble            
                                        
10633 nessita    9 -11  330m 7100 4364 R   2.3  0.1   0:05.73 pulseaudio

Last few lines from pulse log are:

.... a lot ....
( 168.054|   0.000) E: [alsa-sink-ALC889 Analog] protocol-native.c: 
request_bytes(192)
( 168.054|   0.000) E: [alsa-sink-ALC889 Analog] protocol-native.c: ALSA 
Playback, pop(): 0
( 168.054|   0.000) E: [pulseaudio] protocol-native.c: Requesting 2048 bytes
( 168.054|   0.000) E: [pulseaudio] protocol-native.c: signalling underflow
( 168.059|   0.004) E: [alsa-sink-ALC889 Analog] protocol-native.c: ALSA 
Playback, pop(): 0
( 169.389|   1.330) I: [alsa-sink-ALC889 Analog] alsa-sink.c: Scheduling delay 
of 1.02ms > 0.96ms, you might want to investigate this to improve latency...
( 173.060|   3.671) I: [pulseaudio] module-suspend-on-idle.c: Sink 
alsa_output.pci-0000_00_1b.0.analog-stereo idle for too long, suspending ...
( 173.061|   0.000) I: [alsa-sink-ALC889 Analog] alsa-sink.c: Device 
suspended...
( 251.342|  78.281) I: [alsa-source-ALC889 Analog] alsa-source.c: Scheduling 
delay of 4.75ms, you might want to investigate this to improve latency...
( 251.409|   0.066) I: [alsa-source-ALC889 Analog] alsa-source.c: Scheduling 
delay of 12.15ms, you might want to investigate this to improve latency...
( 251.409|   0.000) I: [alsa-source-ALC889 Analog] alsa-source.c: Overrun!
( 251.409|   0.000) I: [alsa-source-ALC889 Analog] alsa-source.c: Increasing 
wakeup watermark to 16.00 ms
( 256.575|   5.166) I: [alsa-source-ALC889 Analog] alsa-source.c: Scheduling 
delay of 6.29ms, you might want to investigate this to improve latency...
( 256.591|   0.015) I: [alsa-source-ALC889 Analog] alsa-source.c: Scheduling 
delay of 5.32ms, you might want to investigate this to improve latency...
( 269.375|  12.784) I: [alsa-source-ALC889 Analog] alsa-source.c: Scheduling 
delay of 9.03ms, you might want to investigate this to improve latency...
( 277.341|   7.966) I: [alsa-source-ALC889 Analog] alsa-source.c: Scheduling 
delay of 6.62ms, you might want to investigate this to improve latency...
( 285.666|   8.324) I: [alsa-source-ALC889 Analog] alsa-source.c: Scheduling 
delay of 3.16ms, you might want to investigate this to improve latency...

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to alsa-driver in Ubuntu.
https://bugs.launchpad.net/bugs/1201528

Title:
  [Realtek ALC889] - Audio Playback Unavailable

Status in “alsa-driver” package in Ubuntu:
  New

Bug description:
  This is a fresh upgrade to raring. During the weekend, I updated from
  precise to quantal, and from there to raring. I did not use sound
  while the system was in quantal, so no idea if the bug was present
  there as well.

  The symptom is:

  * after some period of sound usage, playback stops working

  What I mean with sound usage is:

  I tried having a meeting with: mumble, skype, and google hangout, and
  in all three cases, audio input/outout will work just fine for ~5
  minutes, and the playback just dies (people tell me they keep
  listening to me, so mic works fine).

  The only way to solve this is by rebooting. After one of the reboots,
  I was able to play a 20 minute video with mplayer with no further
  issue. Then opened skype and after ~3-5 minute talk, audio playback
  died again.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.8.0-26.38-generic 3.8.13.2
  Uname: Linux 3.8.0-26-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.9.2-0ubuntu8.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  nessita    2627 F.... pulseaudio
  Date: Mon Jul 15 14:40:20 2013
  InstallationDate: Installed on 2011-12-20 (572 days ago)
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 
(20111129.1)
  MarkForUpload: True
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:MID failed
  Symptom_AlsaPlaybackTestStderr:
   W r i t e   e r r o r :   - 5 , I n p u t / o u t p u t   e r r o r 
    x r u n _ r e c o v e r y   f a i l e d :   - 5 , I n p u t / o u t p u t   
e r r o r 
    T r a n s f e r   f a i l e d :   O p e r a t i o n   n o t   p e r m i t t 
e d
  Symptom_Card: Built-in Audio - HDA Intel MID
  Symptom_Jack: Green Headphone Out, Front
  Symptom_Type: None of the above
  Title: [, Realtek ALC889, Green Headphone Out, Front] Playback problem
  UpgradeStatus: Upgraded to raring on 2013-07-13 (2 days ago)
  dmi.bios.date: 08/05/2009
  dmi.bios.vendor: Intel Corp.
  dmi.bios.version: KGIBX10J.86A.3206.2009.0805.1855
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: DP55WG
  dmi.board.vendor: Intel Corporation
  dmi.board.version: AAE57269-404
  dmi.chassis.type: 2
  dmi.modalias: 
dmi:bvnIntelCorp.:bvrKGIBX10J.86A.3206.2009.0805.1855:bd08/05/2009:svn:pn:pvr:rvnIntelCorporation:rnDP55WG:rvrAAE57269-404:cvn:ct2:cvr:

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