[Alsa-user] Multiple identical codecs on intel-hda

[Christopher E P. <ce...@ri...>]

Hi,

I have an Atom based vehicle computer (Poulsbo chipset) with an Intel HDA "card".  For some reason it has two identical codecs, both Realtek ALC888.  One is hooked to the speakers built into the display; the other is attached to the line in/out on the back of the computer.  I am trying to get the back ones working, and I never get any audio out of them.

It appears they both do show up:

$ ls /proc/asound/card0
codec#0  codec#1  id  pcm0c  pcm0p  pcm2c  pcm4c  pcm4p  pcm5c

$ cat /proc/asound/pcm
00-00: ALC888 Analog : ALC888 Analog : playback 1 : capture 1
00-02: ALC888 Analog : ALC888 Analog : capture 1
00-04: ALC888 Analog : ALC888 Analog : playback 1 : capture 1
00-05: ALC888 Analog : ALC888 Analog : capture 1

but there are a couple of serious problems:


$ amixer
ALSA lib simple_none.c:1551:(simple_add1) helem (MIXER,'Master Playback Switch',0,1,0) appears twice or more
amixer: Mixer default load error: Invalid argument

(running alsamixer yields the same results)

Second, I tried to configure the second device as:

pcm.backout {
   card 0
   device 4
}

but I can't get aplay -D backout  to play.  It doesn't like any combination of number of channels I throw at it.

At this stage of alsa development, should this work?

Here's some version information


Linux 3.2.0-23-generic-pae #36-Ubuntu SMP Tue Apr 10 22:19:09 UTC 2012 i686 i686 i386 GNU/Linux
alsa-base            1.0.25+dfsg-0ubuntu1 
alsa-utils             1.0.25-1ubuntu5
libasound2          1.0.25-1ubuntu10
linux-sound-base 1.0.25+dfsg-0ubuntu1


--Chris