Clicks and noise over S/PDIF at 44100Hz

[Phill]

Bus 002 Device 005: ID 0d8c:0102 C-Media Electronics, Inc. CM106 Like Sound Device connected using S/PDIF optical out.

Playing audio at 44100Hz has clicks and a quiet cyclical noise at roughly 5 cycles per second. The noise is like a really quiet shaker. Clicking seems random and of varying intensity.

Affects multiple applications including Rhythmbox and Kodi. Even `aplay` using a raw CD file copied to disk.

Higher playback rates of 48000Hz are clean and work fine with AC3 and DTS encoded pass-through. I tested this in Kodi where you can pick the playback rate with on-the-fly re-sampling. Same sound re-sampled and played at 48000Hz plays flawlessly, everything at 44100Hz has the problem.

Previous sound card (integrated) is fine. HDMI output is also fine.

Tried the `tsched=0` workaround, did not work.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: pulseaudio 1:4.0-0ubuntu11.1
ProcVersionSignature: Ubuntu 3.16.0-49.65~14.04.1-generic 3.16.7-ckt15
Uname: Linux 3.16.0-49-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.13
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: mediacentre 3018 F.... pulseaudio
 /dev/snd/controlC0: mediacentre 3018 F.... pulseaudio
CurrentDesktop: Unity
CurrentDmesg: Error: command ['sh', '-c', 'dmesg | comm -13 --nocheck-order /var/log/dmesg -'] failed with exit code 1: comm: /var/log/dmesg: Permission denied
Date: Sun Sep 20 15:10:57 2015
InstallationDate: Installed on 2015-07-02 (80 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
SourcePackage: pulseaudio
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/21/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: E1681IG6 VER.109
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: To be filled by O.E.M.
dmi.board.vendor: Micro-Star International
dmi.board.version: Ver.001
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 9
dmi.chassis.vendor: Micro-Star International
dmi.chassis.version: Ver.001
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrE1681IG6VER.109:bd07/21/2010:svnMicro-StarInternational:pnCalpellaplatform:pvrVer.001:rvnMicro-StarInternational:rnTobefilledbyO.E.M.:rvrVer.001:cvnMicro-StarInternational:ct9:cvrVer.001:
dmi.product.name: Calpella platform
dmi.product.version: Ver.001
dmi.sys.vendor: Micro-Star International
modified.conffile..etc.pulse.default.pa: [modified]
mtime.conffile..etc.pulse.default.pa: 2015-09-20T15:04:55.963646