kernel-packages team mailing list archive

[Etienne URBAH <eurbah@xxxxxxx>]

After updating the BIOS and the Linux Kernel, the issue stays completely the same.
So, I am trying to mark this report Status 'Confirmed'. 

# dmidecode -t 0  |  grep -E 'BIOS Information|Vendor|Version|Release'

BIOS Information
	Vendor: American Megatrends Inc.
	Version: 2603
	Release Date: 06/26/2015

# uname -r

4.3.0-040300rc5-generic

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https://bugs.launchpad.net/bugs/1504227

Title:
  Sound output starts several seconds late using DisplayPort with
  [AMD/ATI] Tahiti XT HDMI Audio [Radeon HD 7970 Series] [1002:aaa0]

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I am using simultaneously :
  -  an audio headset connected to the analog audio output,
  -  a DisplayPort cable to connect my display to my 'AMD Tahiti XT [Radeon HD 7970 ...]' graphics + sound card.

  Using the 'Sound' panel of 'gnome-control-center', I systematically
  get following behaviour for sound output :

  -  If I choose the 'Line Out - Built-in Audio' device, the sound output comes immediately :
     For example, inside the 'Test Speakers' window, the correct sound systematically starts as soon as I hit any 'Test' button (under 'Front Left' or 'Front Right').

  -  But if I choose the 'HDMI / DisplayPort - Tahiti XT HDMI Audio [Radeon HD 7970 Series]' device, the sound output starts several seconds LATE :
     For example, inside the 'Test Speakers' window, the sound starts at the end of the 2nd time I hit any 'Test' button (under 'Front Left' or 'Front Right').  Then continuous sound is correct and in sync.
     But after approx. 10s of silence (no sound to output), new sound output starts several seconds LATE again.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-14-generic 4.2.0-14.16
  ProcVersionSignature: Ubuntu 4.2.0-14.16-generic 4.2.2
  Uname: Linux 4.2.0-14-generic x86_64
  ApportVersion: 2.19-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/pcmC0D0c:   z_admin    1665 F...m pulseaudio
   /dev/snd/controlC0:  z_admin    1665 F.... pulseaudio
   /dev/snd/controlC1:  z_admin    1665 F.... pulseaudio
  CurrentDesktop: GNOME
  Date: Thu Oct  8 17:46:05 2015
  HibernationDevice: RESUME=UUID=ccecc437-66d2-4e39-ac56-76ab11e18140
  InstallationDate: Installed on 2015-09-27 (10 days ago)
  InstallationMedia: Ubuntu-GNOME 15.10 "Wily Werewolf" - Alpha amd64 (20150924)
  IwConfig:
   enp2s0    no wireless extensions.

   lo        no wireless extensions.
  MachineType: To be filled by O.E.M. To be filled by O.E.M.
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-14-generic root=UUID=a5c156d8-eac3-47fa-835c-b2c4ebda969d ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-14-generic N/A
   linux-backports-modules-4.2.0-14-generic  N/A
   linux-firmware                            1.149
  RfKill:

  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/07/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2501
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: M5A97 R2.0
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2501:bd04/07/2014:svnTobefilledbyO.E.M.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnASUSTeKCOMPUTERINC.:rnM5A97R2.0:rvrRev1.xx:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To be filled by O.E.M.
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: To be filled by O.E.M.

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