Public bug reported:
Hi,
I recently updated a system to Ubuntu 16.04.1 LTS from 14.04.5 LTS.
After the upgrade, the sound quality I get over the SPDIF output is
terrible -- I hear crackling/noise when no sound is being played, and
when I play a sound it is heavily distorted. The situation was much
better (if not quite perfect) in 14.04.5.
The system runs on an ASROCK N3150DC-ITX board with a coaxial SPDIF
cable connected to the headers on the board.
$ cat /proc/asound/version
Advanced Linux Sound Architecture Driver Version k4.4.0-59-generic.
$ cat /proc/asound/card0/codec* | grep Codec
Codec: Realtek ALC892
Codec: Intel Braswell HDMI
in alsamixer it shows:
Card: HDA Intel PCH
Chip: Realtek ALC892
I can't confirm this, but I believe that in 14.04.5 this showed the
'Chip' as 'Intel Braswell HDMI'
The alsamixer control for my SPDIF output is called 'SPDIF 16'
muting/unmuting this works, and no other combination of controls I have
tried changing has any effect. 'SPDIF 1' and 'SPDIF 2' are also present
in alsamixer
I tried the position_fix suggestion here
https://wiki.ubuntu.com/Audio/PositionReporting, but it didn't make any
difference.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 4.4.0-59.80-generic 4.4.35
Uname: Linux 4.4.0-59-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.4
Architecture: amd64
AudioDevicesInUse:
USERPID ACCESS COMMAND
/dev/snd/controlC0: oliver 2174 F lxpanel
Date: Tue Jan 10 18:40:24 2017
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
UpgradeStatus: Upgraded to xenial on 2017-01-08 (2 days ago)
dmi.bios.date: 06/22/2015
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P1.00
dmi.board.name: N3150DC-ITX
dmi.board.vendor: ASRock
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.:bvrP1.00:bd06/22/2015:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnN3150DC-ITX:rvr: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.
mtime.conffile..etc.modprobe.d.alsa-base.conf: 2017-01-10T18:34:19.982437
** Affects: alsa-driver (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug xenial
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https://bugs.launchpad.net/bugs/1655429
Title:
Noise and poor audio quality over SPDIF (regression since 14.X LTS)
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