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[Raymond <1388436@xxxxxxxxxxxxxxxxxx>]

ubuntu only use 64k buffer

http://lists.freedesktop.org/archives/pulseaudio-
discuss/2014-October/021998.html

sample spec: s16le 8ch 44100Гц
	channel map: front-left,front-right,rear-left,rear-right,front-center,lfe,side-left,side-right
	             Объёмный 7.1
	used by: 0
	linked by: 0
	configured latency: 0,00 ms; range is 0,50 .. 92,88 ms


https://wiki.ubuntu.com/PulseAudio/Log

check whether you get underrun/overrun in verbose pulseaudio log


this 92.88ms may be too small for 7.1 audio

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https://bugs.launchpad.net/bugs/1388436

Title:
  ga-z97-d3h motherboard, no sound using line out

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

Bug description:
  Problems with the sound (chipset z97). I've got the sound in Windows -
  so it is a software bug. Freshly installed default system. First time
  this was Kubuntu 14.04 then it was upgraded to 14.10 for a fresh
  kernel. No effect to  the problem. Found the similar problems here
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1321421, but none
  of the workarounds helped me. Upgrading to the 3.17 kernel dind't
  help.

  meklon@meklon-desktop:~$ lsb_release -rd                                                                                                                                       
  Description:    Ubuntu 14.10                                                                                                                                                   
  Release:        14.10      
  meklon@meklon-desktop:~$ uname -a
  Linux meklon-desktop 3.16.0-24-generic #32-Ubuntu SMP Tue Oct 28 13:07:32 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

  Expecting: sound output from the rear panel.
  What happened: no sound at all.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.16.0-24.32-generic 3.16.4
  Uname: Linux 3.16.0-24-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/pcmC1D3p:   meklon     3589 F...m pulseaudio
   /dev/snd/controlC1:  meklon     3589 F.... pulseaudio
   /dev/snd/controlC0:  meklon     3589 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Sat Nov  1 22:45:33 2014
  InstallationDate: Installed on 2014-10-31 (1 days ago)
  InstallationMedia: Kubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:HDMI failed
  Symptom_Card: Cayman/Antilles HDMI Audio [Radeon HD 6900 Series] - HDA ATI HDMI
  Symptom_Jack: Digital Out, HDMI
  Symptom_Type: None of the above
  Title: [Z97-D3H, ATI R6xx HDMI, Digital Out, HDMI] Playback problem
  UpgradeStatus: Upgraded to utopic on 2014-11-01 (0 days ago)
  dmi.bios.date: 04/25/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: F4
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: Z97-D3H-CF
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF4:bd04/25/2014:svnGigabyteTechnologyCo.,Ltd.:pnZ97-D3H:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnZ97-D3H-CF:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: Z97-D3H
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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