Re: Strange alsa behaviour

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On Thu, 2 Sep 2010, Cyril Russo wrote:

>
>  Hi,
>
>  I've an issue with my new Creative Audigy sound card.
> I'm using a Debian Squeeze (with official 2.6.32-5-amd64 kernel) system.
> I've done this step to ensure I'm using the latest version:
> sudo module-assistant auto-install alsa (which installed the driver from
> alsa-driver 1.0.23's package)
>
> The sound card is correctly detected and it's working, but I've an
> issue, in that each channel appears as a different device.
> So in all the software using Alsa I have to select a device and it
> outputs on a single stereo channel for this particular device.
>
> For example, this command lists:
> # aplay -l
> **** List of PLAYBACK Hardware Devices ****
> card 0: CA0106 [CA0106], device 0: ca0106 [CA0106]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
> card 0: CA0106 [CA0106], device 1: ca0106 [CA0106]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
> card 0: CA0106 [CA0106], device 2: ca0106 [CA0106]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
> card 0: CA0106 [CA0106], device 3: ca0106 [CA0106]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
>
> Here the /proc/asound dump:
> # find /proc/asound/
> /proc/asound/
> /proc/asound/CA0106
> /proc/asound/card0
> /proc/asound/card0/id
> /proc/asound/card0/midi0
> /proc/asound/card0/iec958
> /proc/asound/card0/ca0106_reg32
> /proc/asound/card0/ca0106_reg16
> /proc/asound/card0/ca0106_reg8
> /proc/asound/card0/ca0106_regs1
> /proc/asound/card0/ca0106_i2c
> /proc/asound/card0/ca0106_regs2
> /proc/asound/card0/pcm3c
> /proc/asound/card0/pcm3c/sub0
> /proc/asound/card0/pcm3c/sub0/prealloc_max
> /proc/asound/card0/pcm3c/sub0/prealloc
> /proc/asound/card0/pcm3c/sub0/status
> /proc/asound/card0/pcm3c/sub0/sw_params
> /proc/asound/card0/pcm3c/sub0/hw_params
> /proc/asound/card0/pcm3c/sub0/info
> /proc/asound/card0/pcm3c/info
> /proc/asound/card0/pcm3p
> /proc/asound/card0/pcm3p/sub0
> /proc/asound/card0/pcm3p/sub0/prealloc_max
> /proc/asound/card0/pcm3p/sub0/prealloc
> /proc/asound/card0/pcm3p/sub0/status
> /proc/asound/card0/pcm3p/sub0/sw_params
> /proc/asound/card0/pcm3p/sub0/hw_params
> /proc/asound/card0/pcm3p/sub0/info
> /proc/asound/card0/pcm3p/info
> /proc/asound/card0/pcm2c
> /proc/asound/card0/pcm2c/sub0
> /proc/asound/card0/pcm2c/sub0/prealloc_max
> /proc/asound/card0/pcm2c/sub0/prealloc
> /proc/asound/card0/pcm2c/sub0/status
> /proc/asound/card0/pcm2c/sub0/sw_params
> /proc/asound/card0/pcm2c/sub0/hw_params
> /proc/asound/card0/pcm2c/sub0/info
> /proc/asound/card0/pcm2c/info
> /proc/asound/card0/pcm2p
> /proc/asound/card0/pcm2p/sub0
> /proc/asound/card0/pcm2p/sub0/prealloc_max
> /proc/asound/card0/pcm2p/sub0/prealloc
> /proc/asound/card0/pcm2p/sub0/status
> /proc/asound/card0/pcm2p/sub0/sw_params
> /proc/asound/card0/pcm2p/sub0/hw_params
> /proc/asound/card0/pcm2p/sub0/info
> /proc/asound/card0/pcm2p/info
> /proc/asound/card0/pcm1c
> /proc/asound/card0/pcm1c/sub0
> /proc/asound/card0/pcm1c/sub0/prealloc_max
> /proc/asound/card0/pcm1c/sub0/prealloc
> /proc/asound/card0/pcm1c/sub0/status
> /proc/asound/card0/pcm1c/sub0/sw_params
> /proc/asound/card0/pcm1c/sub0/hw_params
> /proc/asound/card0/pcm1c/sub0/info
> /proc/asound/card0/pcm1c/info
> /proc/asound/card0/pcm1p
> /proc/asound/card0/pcm1p/sub0
> /proc/asound/card0/pcm1p/sub0/prealloc_max
> /proc/asound/card0/pcm1p/sub0/prealloc
> /proc/asound/card0/pcm1p/sub0/status
> /proc/asound/card0/pcm1p/sub0/sw_params
> /proc/asound/card0/pcm1p/sub0/hw_params
> /proc/asound/card0/pcm1p/sub0/info
> /proc/asound/card0/pcm1p/info
> /proc/asound/card0/pcm0c
> /proc/asound/card0/pcm0c/sub0
> /proc/asound/card0/pcm0c/sub0/prealloc_max
> /proc/asound/card0/pcm0c/sub0/prealloc
> /proc/asound/card0/pcm0c/sub0/status
> /proc/asound/card0/pcm0c/sub0/sw_params
> /proc/asound/card0/pcm0c/sub0/hw_params
> /proc/asound/card0/pcm0c/sub0/info
> /proc/asound/card0/pcm0c/info
> /proc/asound/card0/pcm0p
> /proc/asound/card0/pcm0p/sub0
> /proc/asound/card0/pcm0p/sub0/prealloc_max
> /proc/asound/card0/pcm0p/sub0/prealloc
> /proc/asound/card0/pcm0p/sub0/status
> /proc/asound/card0/pcm0p/sub0/sw_params
> /proc/asound/card0/pcm0p/sub0/hw_params
> /proc/asound/card0/pcm0p/sub0/info
> /proc/asound/card0/pcm0p/info
> /proc/asound/pcm
> /proc/asound/timers
> /proc/asound/modules
> /proc/asound/cards
> /proc/asound/devices
> /proc/asound/version
> /proc/asound/seq
> /proc/asound/seq/timer
> /proc/asound/seq/clients
> /proc/asound/seq/queues
> /proc/asound/seq/drivers
> /proc/asound/oss
> /proc/asound/oss/sndstat
> /proc/asound/oss/devices
>
> # cat /proc/asound/cards
>  0 [CA0106         ]: CA0106 - CA0106
>                       Audigy SE [SB0570] at 0xcf00 irq 18
>
> # cat /proc/asound/devices
>   0: [ 0]   : control
>   1:        : sequencer
>   8: [ 0- 0]: raw midi
>  16: [ 0- 0]: digital audio playback
>  17: [ 0- 1]: digital audio playback
>  18: [ 0- 2]: digital audio playback
>  19: [ 0- 3]: digital audio playback
>  24: [ 0- 0]: digital audio capture
>  25: [ 0- 1]: digital audio capture
>  26: [ 0- 2]: digital audio capture
>  27: [ 0- 3]: digital audio capture
>  33:        : timer
>
>
> I've an empty .asoundrc (Using a more complex .asoundrc I'm able to
> duplicate a channel to all other channels, but it's only duplication,
> it's the same sound on all channels)
> As such the audio softwares usually list this while enumerating the devices:
> ALSA device: hw:CA0106,0 outs=2-2 ins=2-2 rates=3
> ALSA device: hw:CA0106,1 outs=2-2 ins=2-2 rates=3
> ALSA device: hw:CA0106,2 outs=2-2 ins=2-2 rates=3
> ALSA device: hw:CA0106,3 outs=2-2 ins=2-2 rates=3
>
> I want them to list a single device with 8 outputs, and not 4 devices
> with 2 outputs.
> I have other systems with different sound cards and it's the first time
> I'm seeing this.

Use surround71 device (like 'aplay -D plug:surround71'). It combines the 
stereo devices to a 8-channel device.

 					Jaroslav

-----
Jaroslav Kysela <perex@xxxxxxxx>
Linux Kernel Sound Maintainer
ALSA Project, Red Hat, Inc.


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