try channel check
http://www.dolby.com/us/en/consumer/technology/home-theater/dolby-
digital-plus-download.html
mplayer -channel 8 -ao alsa:device=hw=0
Early Patching
~~~~~~~~~~~~~~
When CONFIG_SND_HDA_PATCH_LOADER=y is set, you can pass a "patch" as a
firmware file for modifying the HD-audio setup before initializing the
codec. This can work basically like the reconfiguration via sysfs in
the above, but it does it before the first codec configuration.
A patch file is a plain text file which looks like below:
------------------------------------------------------------------------
[codec]
0x12345678 0xabcd1234 2
0x10ec0892 0x15588000 0
[model]
auto
[pincfg]
0x15 0x411111f0
0x16 0x411111f0
0x1b 0x01011410
0x18 0x01011411
0x1a 0x01011412
0x17 0x01011413
[hint]
add_jack_modes = true
------------------------------------------------------------------------
The hd-audio driver reads the file via request_firmware(). Thus,
a patch file has to be located on the appropriate firmware path,
typically, /lib/firmware. For example, when you pass the option
`patch=hda-init.fw`, the file /lib/firmware/hda-init.fw must be
present.
The patch module option is specific to each card instance, and you
need to give one file name for each instance, separated by commas.
For example, if you have two cards, one for an on-board analog and one
for an HDMI video board, you may pass patch option like below:
------------------------------------------------------------------------
options snd-hda-intel patch=on-board-patch,hdmi-patch
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1236965
Title:
pulseaudio does not recognize internal speakers [P180HMx, Realtek
ALC892, Speaker, Internal] volume slider problem
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https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1236965/+subscriptions
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