Some log output which I got from:
"$ echo autospawn = no >> ~/.pulse/client.conf
$ pulseaudio -k
$ LANG=C timeout --foreground -k 10 -s kill 10 pulseaudio -vvvv 2>&1 | grep 
device.buffering -B 10
$ sed -i '$d' ~/.pulse/client.conf"

I: [pulseaudio] sink.c:     alsa.long_card_name = "HDA Intel at 0xf4700000 irq 
47"
I: [pulseaudio] sink.c:     alsa.driver_name = "snd_hda_intel"
I: [pulseaudio] sink.c:     device.bus_path = "pci-0000:00:1b.0"
I: [pulseaudio] sink.c:     sysfs.path = 
"/devices/pci0000:00/0000:00:1b.0/sound/card0"
I: [pulseaudio] sink.c:     device.bus = "pci"
I: [pulseaudio] sink.c:     device.vendor.id = "8086"
I: [pulseaudio] sink.c:     device.vendor.name = "Intel Corporation"
I: [pulseaudio] sink.c:     device.product.name = "N10/ICH 7 Family High 
Definition Audio Controller"
I: [pulseaudio] sink.c:     device.form_factor = "internal"
I: [pulseaudio] sink.c:     device.string = "front:0"
I: [pulseaudio] sink.c:     device.buffering.buffer_size = "65536"
I: [pulseaudio] sink.c:     device.buffering.fragment_size = "32768"
--
I: [pulseaudio] source.c:     alsa.long_card_name = "HDA Intel at 0xf4700000 
irq 47"
I: [pulseaudio] source.c:     alsa.driver_name = "snd_hda_intel"
I: [pulseaudio] source.c:     device.bus_path = "pci-0000:00:1b.0"
I: [pulseaudio] source.c:     sysfs.path = 
"/devices/pci0000:00/0000:00:1b.0/sound/card0"
I: [pulseaudio] source.c:     device.bus = "pci"
I: [pulseaudio] source.c:     device.vendor.id = "8086"
I: [pulseaudio] source.c:     device.vendor.name = "Intel Corporation"
I: [pulseaudio] source.c:     device.product.name = "N10/ICH 7 Family High 
Definition Audio Controller"
I: [pulseaudio] source.c:     device.form_factor = "internal"
I: [pulseaudio] source.c:     device.string = "front:0"
I: [pulseaudio] source.c:     device.buffering.buffer_size = "65536"
I: [pulseaudio] source.c:     device.buffering.fragment_size = "32768"

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https://bugs.launchpad.net/bugs/1183145

Title:
  sound is distorted

Status in “pulseaudio” package in Ubuntu:
  New

Bug description:
  When you increase the volume to 70-80 % and above, there's a little
  sound distortion (it can be heard especially when human voice is being
  listened).

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: pulseaudio 1:3.0-0ubuntu6
  ProcVersionSignature: Ubuntu 3.8.0-22.33-generic 3.8.11
  Uname: Linux 3.8.0-22-generic i686
  ApportVersion: 2.9.2-0ubuntu8
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  miroslav   1960 F.... pulseaudio
  Date: Thu May 23 01:19:03 2013
  InstallationDate: Installed on 2013-05-15 (7 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release i386 (20130424)
  MarkForUpload: True
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not 
accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  SourcePackage: pulseaudio
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/11/2008
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 68YAF Ver. F.1D
  dmi.board.name: 309F
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 54.3D
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: 
dmi:bvnHewlett-Packard:bvr68YAFVer.F.1D:bd07/11/2008:svnHewlett-Packard:pn:pvrF.1D:rvnHewlett-Packard:rn309F:rvrKBCVersion54.3D:cvnHewlett-Packard:ct10:cvr:
  dmi.product.version: F.1D
  dmi.sys.vendor: Hewlett-Packard

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