Public bug reported:

Alsa only shows "master" and "PCM" as output on this card. There is no
option for external toslink optical spdif. There is no subdevice for the
spdif link. This link works under Windows.

This info-collecting script from 
"https://wiki.ubuntu.com/DebuggingSoundProblems"; produces an error:
r...@steph-desktop:~# find /proc/asound/card* -type f | grep codec | xargs grep 
"^Codec\|^Vendor Id\|^Subsystem Id\|^Revision Id" | grep -B2 -A1 $(lspci -nv | 
grep -A1 0403 | grep Subsystem | sed 's/://g' | awk '{ print $2 }')
grep: 1462aa50: No such file or directory

My guess is that either the southbridge (ATI SB850) or the audio codec
(VIA VT1818) are too recent and lack proper identifications of its
capabilities in Linux.

The headphone output works.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: alsa-base 1.0.22.1+dfsg-0ubuntu3
ProcVersionSignature: Ubuntu 2.6.32-24.39-generic 2.6.32.15+drm33.5
Uname: Linux 2.6.32-24-generic x86_64
NonfreeKernelModules: fglrx
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  steph      1628 F.... amarok
Card0.Amixer.info:
 Card hw:0 'SB'/'HDA ATI SB at 0xfe4f8000 irq 16'
   Mixer name   : 'VIA ID 440'
   Components   : 'HDA:11060440,10438417,00100000'
   Controls      : 5
   Simple ctrls  : 4
Card1.Amixer.info:
 Card hw:1 'U0x46d0x809'/'USB Device 0x46d:0x809 at usb-0000:00:12.2-1, high 
speed'
   Mixer name   : 'USB Mixer'
   Components   : 'USB046d:0809'
   Controls      : 2
   Simple ctrls  : 1
Card1.Amixer.values:
 Simple mixer control 'Mic',0
   Capabilities: cvolume cvolume-joined cswitch cswitch-joined penum
   Capture channels: Mono
   Limits: Capture 0 - 6400
   Mono: Capture 5208 [81%] [26.34dB] [on]
Card2.Amixer.info:
 Card hw:2 'Generic'/'HD-Audio Generic at 0xfe9bc000 irq 19'
   Mixer name   : 'ATI R6xx HDMI'
   Components   : 'HDA:1002aa01,00aa0100,00100200'
   Controls      : 4
   Simple ctrls  : 1
Card2.Amixer.values:
 Simple mixer control 'IEC958',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [on]
Date: Sun Aug  8 13:57:47 2010
InstallationMedia: Kubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100427)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=
 PATH=(custom, user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: alsa-driver
UserAsoundrc:
 # ALSA library configuration file
 
 # Include settings that are under the control of asoundconf(1).
 # (To disable these settings, comment out this line.)
 </home/steph/.asoundrc.asoundconf>
dmi.bios.date: 05/19/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0902
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M4A87TD EVO
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr0902:bd05/19/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM4A87TDEVO:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer

** Affects: alsa-driver (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug lucid

-- 
ASUS MA487TD EVO - ATI SB850 - VIA VT1818 - Linux does not sees external 
toslink spdif output
https://bugs.launchpad.net/bugs/614984
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