[alsa-devel] dsnoop do not works on snd-hda-intel

Maxim Levitsky maximlevitsky at gmail.com
Mon Sep 17 07:32:46 CEST 2007

On Monday 17 September 2007 07:21:03 Giovanni Maruzzelli wrote:
> Hi all,
> I hope someone can give me an hint on this problem, that is stopping me.
> On my new laptop (asus f5v) dsnoop do not works, neither I can record
> at the same moment with more than one application. The second
> application that want to use the dsnoop, fail to open it.
> I'm using Ubuntu 7.04 fully updated.
> lspci gives:
> 00:0f.0 Audio device: Silicon Integrated Systems [SiS] Azalia Audio Controller
> cat /proc/asound/card0/codec#* | grep Codec gives:
> Codec: Realtek ALC660-VD
> Codec: Motorola Si3054
> I've upgraded driver, lib, and utils to 1.0.14 but it do not helped.
> I've put at the end of /etc/modprobe.d/alsa-base
> options snd-hda-intel model=3stack-660
> I can always reproduce the behavior, for eg:
> root at ubuntu-lap:~# arecord -Ddefault ciao.wav &
> [1] 6923
> root at ubuntu-lap:~# Recording WAVE 'ciao.wav' : Unsigned 8 bit, Rate
> 8000 Hz, Mono
> root at ubuntu-lap:~# arecord -Ddefault ciao2.wav &
> [2] 6926
> root at ubuntu-lap:~# ALSA lib pcm_dsnoop.c:606:(snd_pcm_dsnoop_open)
> unable to open slave
> arecord: main:545: audio open error: Invalid argument
> [2]+  Exit 1                  arecord -Ddefault ciao2.wav
> I can give any additional info is needed.
> Thank you all in advance,
> Giovanni Maruzzelli
> _______________________________________________
> Alsa-devel mailing list
> Alsa-devel at alsa-project.org
> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel


I was also hit by this problem 

To fix this you need to open /usr/share/alsa/pcm/dsnoop.conf
and change 

	@args.SUBDEV {
		type string
		default -1


	@args.SUBDEV {
		type string
		default 0

I was told that this is a feature of alsa, not bug, I don't know.

the above will make dsnoop to record from hw:0,0

Also, I bet that your hardware can record more that one stream a time.
So you can also try recording from hw:0,1 or hw:0,2

you can check how many streams can be recording at same time in /proc/asound/Intel/pcm0c/info
look at subdevices_count

Each stream can have its own input source, so check your mixer to make sure that 
each stream records what you want, eg: records from same source, or not,
is enabled or not, and has enough gain.

Best regards,
	Maxim Levisky

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