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: USER PID 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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1655429 Title: Noise and poor audio quality over SPDIF (regression since 14.X LTS) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1655429/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
