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[jpka <jopka@xxxxxxxxx>]

I obtain other receiver module, bc57f687a05 based (appears as BLK-MD-BC05-B). It provides two profiles, HSP/HFP and A2DP. So now i able to switch profiles, but it is not helpful. Switching between them only changes delay but not removes it. HSP/HFP gives 1/4 s but unacceptable sound quality. A2DP gives 1/2 s regardless of switching. Looks like not driver/OS problem, but unavoidable HW problem. I now wonder if someone (using any OS / HW) can get high quality sound via bluetooth without delays. Unless that, bluetooth considered as unusable at all for audio, and also, Kirk Shrewsbury's answer at link mentioned in #2, considered correct.
Thanks.

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https://bugs.launchpad.net/bugs/1211102

Title:
  Get rid of 0.5s latency when playing audio over Bluetooth with A2DP

Status in “bluez” package in Ubuntu:
  Confirmed

Bug description:
  1) The release of Ubuntu you are using, via 'lsb_release -rd' or System -> About Ubuntu
  Description:	Ubuntu 13.04
  Release:	13.04

  2) The version of the package you are using, via 'apt-cache policy pkgname' or by checking in Software Center
  bluez:
    Instalados: 4.101- 0ubuntu8b1
    Candidato:  4.101-0ubuntu8b1
    Tabla de versión:
   *** 4.101-0ubuntu8b1 0
          500 http://es.archive.ubuntu.com/ubuntu/ raring/main amd64 Packages
          100 /var/lib/dpkg/status

  3) What you expected to happen
  The audio always is sync when i listen music on my bluetooth device 
  If i listen music or have a videoconference with skype.. it receive audio perfectly without delay.

  4) What happened instead
   I experience a half a second delay when playing audio over Bluetooth with A2DP.
  This makes watching movies not possible as the sound is not synchronised with the video.

  + If i listen music, then stop about 5 minutes and then restart to listen music, it gets work bad.
  + If i get a skype videoconference, it gets too much delay.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: bluez 4.101-0ubuntu8b1
  ProcVersionSignature: Ubuntu 3.8.0-27.40-generic 3.8.13.4
  Uname: Linux 3.8.0-27-generic x86_64
  ApportVersion: 2.9.2-0ubuntu8.3
  Architecture: amd64
  Date: Mon Aug 12 01:24:24 2013
  InstallationDate: Installed on 2013-07-13 (29 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  InterestingModules: rfcomm bnep btusb bluetooth
  MachineType: ASUSTeK Computer Inc. UX31E
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=es_ES.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-27-generic root=UUID=89d221ec-829a-456e-963d-ec7ac2c7d47d ro crashkernel=384M-2G:64M,2G-:128M quiet splash rootfstype=ext4 vt.handoff=7
  SourcePackage: bluez
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/26/2011
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: UX31E.210
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: UX31E
  dmi.board.vendor: ASUSTeK Computer Inc.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK Computer Inc.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrUX31E.210:bd12/26/2011:svnASUSTeKComputerInc.:pnUX31E:pvr1.0:rvnASUSTeKComputerInc.:rnUX31E:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0:
  dmi.product.name: UX31E
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK Computer Inc.
  hciconfig:
   hci0:	Type: BR/EDR  Bus: USB
   	BD Address: 74:2F:68:CE:17:57  ACL MTU: 1022:8  SCO MTU: 183:5
   	UP RUNNING PSCAN 
   	RX bytes:407502 acl:14820 sco:0 events:8796 errors:0
   	TX bytes:7391611 acl:8717 sco:0 commands:45 errors:0

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