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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