[alsa-devel] HBR audio with intel HDA

ashecrow42 at free.fr ashecrow42 at free.fr
Thu Aug 1 18:29:36 CEST 2013

Hi there,

I have troubles using HBR audio (DTS-HD and Dolby TrueHD). With every 
test, I get no signal in the AV receiver. I have tested using a dts-hd 
encapsulated in spdif sample file (found there 
http://samples.mplayerhq.hu/hdmi/) and commands bellow

- aplay -D hdmi devices
- aplay -D hw devices
- aplay -D plughw devices

Note that I use ubuntu raring with 3.8 kernel that includes Xingchao's 
HBR kernel patches.

A. Configurations I have tested:

- hda driver upgrade (alsa devel ubuntu team daily builds)

- upgrade alsa-lib & alsa-utils (alsa-testing launchpad)

- kernel upgrade to 3.9

- snd_hda_codec_realtek module backlist (to try to disable SPDIF) 

- snd_hda_codec_realtek index = -2 in /etc/modprobe.d/alsa-base.conf

- fresh new ubuntu raring install with no modifications at all: still 
no signal

B. Info:

cat /proc/asound/card0/codec* | grep Codec
Codec: Realtek ALC892
Codec: Intel CougarPoint HDMI

I use zotac ZBOX ID82 (intel HM65 chipset with hdmi and spdif)

with alsa debug and alsa debug verbose enabled in kernel I got the 
alsa-info.txt attached file produced on raring with no modification 
while playing dts-hd sample file with command:

aplay -D hdmi:CARD=PCH,DEV=0 -c8 -fs16_le -r192000 dts.spdif

C. I add that:

- In every test I have non HD audio protocols (DTS and dolby) working 
well in the same configuration

- I have tried with windows just to see if my hardware is broken and I 
get DTS-HD audio with no problem

- Takashi, I've read your HD-Audio.txt file and as far as I see, I have 
no known error message in kernel log

=> I and Wingchao Wang have conclued that it is driver or codec 
related. Can you help me please?

Thanks a lot
PS: sorry if you receive this email twice, I have sent it again as I 
was not member of the list the first time.
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