Sorry to bump in like this, but I was advised to submit a bug-report for
the ALSA-drivers on my HTPC: no sound comes through out of my AVR when I select the digital output through SPDIF (TOSLINK).
The relevant parts of my HTPC are as follows: * CPU: Athlon64 X2 3800+ * Motherboard: ASUS A8N-SLI Deluxe motherboard (BIOS 1805) NForce4
with CK804 sound (relying on a Realtek ALC850 chip)
* RAM: 2x 512 MB DDR-400 * GPU: nVidia Geforce GT240 (which carries a HDMI port and uses the
snd-
* Receiver: Marantz SR7500 (supporting both Dolby Digital 5.1 and DTS
decoding), connected to motherboard's SPDIF TOSLINK port (optical) + JBL 5.1 speaker-set
* OpenElec 4.2.0: Kernel 3.16.3, Alsa 1.0.28Symptoms: Speaker-test does not produce any sound. Command used is as follows:
speaker-test -c2 -r 48000 -D hw:0,2No sound either from other applications (such as XBMC 13.2).
SPDIF worked flawlessly on the exact same hardware & connections using
Win7/XBMC.
Sound does come through the SPDIF when I use hw:0,0 (= analog device).
Things tried (none working): * Blacklisting snd-hda-intel (= HDMI from my GPU) to make sure CK804
is the only sound chip visible.
* amixer set 'IEC958 Playback AC97-SPSA' Playback 100% unmute
http://www.realtek.com.tw/products/productsView.aspx?Langid=1&PFid=31&am...
Take a look at alc850 datasheet
Simple mixer control 'IEC958 Playback AC97-SPSA',0 Capabilities: volume volume-joined Playback channels: Mono Capture channels: Mono Limits: 0 - 3 Mono: 0 [0%]
This is not volume control, it is SPDIF out Slot Assignment in ac97 link
You have to use iec958:CARD=CK804
http://git.alsa-project.org/?p=alsa-lib.git;a=blob;f=src/conf/cards/NFORCE.c...
Simple mixer control 'IEC958 Playback Source',0 Capabilities: enum Items: 'PCM' 'Analog In' 'IEC958 In Item0: 'PCM'
* Contacted XBMC developer via IRC for investigation: concluded that
problem would be with kernel driver, advised to create this bug-report.
* Tried another distro (Ubuntu from XBMCBuntu 13.0).Further details which might be useful: * alsa-info.sh output:http://pastebin.com/Bp2ZGfZb
* /proc/asound/card0/ac97#0-0:http://pastebin.com/Q5y1J0Ra * /proc/asound/card0/ac97#0-0+regs:http://pastebin.com/tBbTCxZgSimilar reports found (no working solution):
http://mailman.alsa-project.org/pipermail/alsa-devel/2009-September/021336.h...
http://askubuntu.com/questions/264272/no-sound-output-msi-k8n-neo4-ck804-ac9...
http://askubuntu.com/questions/462605/new-install-of-ubuntu-14-04-trusty-3-a...
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=615225 http://ehc.ac/p/alsa/mailman/message/25973743/ http://wiki.linuxmce.org/index.php/ASUS_A8N-SLI_Deluxe http://forum.xbmc.org/showthread.php?tid=156043&pid=1348176 http://forum.xbmc.org/showthread.php?tid=168608 http://ubuntuforums.org/showthread.php?t=2210288 http://cholla.mmto.org/computers/linux/sound/asus_a8ne.html http://www.nvnews.net/vbulletin/showthread.php?t=80521 ...