amixer issues

amixer issues

[Adrian McMenamin]

I have a working sound card with a working (if basic) PCM mixer:

/proc/asound # cat cards
0 [AICA           ]: snd_card_aica - AICA
                     Yamaha AICA Super Intelligent Sound Processor for
SEGA Dreamcast


but when I try to use amixer nothing seems to work:

/ # amixer -c 0
Invalid card number.
Usage: amixer <options> command


any clues?



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Re: amixer issues

[Clemens Ladisch]

Adrian McMenamin wrote:
> I have a working sound card with a working (if basic) PCM mixer:
> 
> /proc/asound # cat cards
> 0 [AICA           ]: snd_card_aica - AICA
>                      Yamaha AICA Super Intelligent Sound Processor for SEGA Dreamcast
> 
> but when I try to use amixer nothing seems to work:
> 
> / # amixer -c 0
> Invalid card number.
> Usage: amixer <options> command

Does /dev/snd/controlC0 exist, and does it point to the control device
listed in /proc/asound/devices?


Regards,
Clemens


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Re: amixer issues

[Lee Revell]

On Tue, 2006-04-04 at 18:17 +0200, Clemens Ladisch wrote:
> Does /dev/snd/controlC0 exist, and does it point to the control device
> listed in /proc/asound/devices?
> 

Can you please clarify?  How does a device node "point to" something?

$ ls -al /dev/snd/controlC0
crw-rw---- 1 root audio 116, 0 Apr  1 10:06 /dev/snd/controlC0

$ cat /proc/asound/devices 
  0: [ 0]   : control
  1:        : sequencer
  4: [ 0- 0]: hardware dependent
  6: [ 0- 2]: hardware dependent
  8: [ 0- 0]: raw midi
  9: [ 0- 1]: raw midi
 10: [ 0- 2]: raw midi
 11: [ 0- 3]: raw midi
 16: [ 0- 0]: digital audio playback
 18: [ 0- 2]: digital audio playback
 19: [ 0- 3]: digital audio playback
 20: [ 0- 4]: digital audio playback
 24: [ 0- 0]: digital audio capture
 25: [ 0- 1]: digital audio capture
 26: [ 0- 2]: digital audio capture
 28: [ 0- 4]: digital audio capture
 33:        : timer

Lee



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Re: amixer issues

[Clemens Ladisch]

Lee Revell wrote:
> On Tue, 2006-04-04 at 18:17 +0200, Clemens Ladisch wrote:
> > Does /dev/snd/controlC0 exist, and does it point to the control device
> > listed in /proc/asound/devices?
> 
> $ ls -al /dev/snd/controlC0
> crw-rw---- 1 root audio 116, 0 Apr  1 10:06 /dev/snd/controlC0
> 
> $ cat /proc/asound/devices 
>   0: [ 0]   : control
>   ...
> 
> Can you please clarify?  How does a device node "point to" something?

The minor number of the device node (here: 0) must be the same as the
minor number of the actual device.


HTH
Clemens


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Re: amixer issues

[Clemens Ladisch]

Steve deRosier wrote:
> Is there any place that the Alsa minor numbers are documented?  

In the source.  ;-)

Both alsa-kernel/include/minors.h and alsa-driver/snddevices know about
the minor numbers.

When CONFIG_SND_DYNAMIC_MINORS is enabled, minor numbers are random.


HTH
Clemens


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Re: amixer issues

[Adrian McMenamin]

On Tue, 2006-04-04 at 18:17 +0200, Clemens Ladisch wrote:
> Adrian McMenamin wrote:
> > I have a working sound card with a working (if basic) PCM mixer:
> > 
> > /proc/asound # cat cards
> > 0 [AICA           ]: snd_card_aica - AICA
> >                      Yamaha AICA Super Intelligent Sound Processor for SEGA Dreamcast
> > 
> > but when I try to use amixer nothing seems to work:
> > 
> > / # amixer -c 0
> > Invalid card number.
> > Usage: amixer <options> command
> 
> Does /dev/snd/controlC0 exist, and does it point to the control device
> listed in /proc/asound/devices?
> 
> 


/ # ls -l /dev/snd
crw-rw-rw-    1 root     sys      116,   0 Apr  4 19:13 controlC0
crw-rw-rw-    1 root     sys      116,  16 Apr  4 19:13 pcmC0D0p
crw-rw-rw-    1 root     sys      116,  33 Apr  4 19:13 timer



/ # cat /proc/asound/devices
 16: [0- 0]: digital audio playback
  0: [0- 0]: ctl
 33:       : timer


Does that mean they agree? Looks like it to me, but I'm not *absolutely*
sure what I am looking for.




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Re: amixer issues

[Clemens Ladisch]

Adrian McMenamin wrote:
> On Tue, 2006-04-04 at 18:17 +0200, Clemens Ladisch wrote:
> > Adrian McMenamin wrote:
> > > / # amixer -c 0
> > > Invalid card number.
> > > Usage: amixer <options> command
> > 
> > Does /dev/snd/controlC0 exist, and does it point to the control device
> > listed in /proc/asound/devices?
> 
> / # ls -l /dev/snd
> crw-rw-rw-    1 root     sys      116,   0 Apr  4 19:13 controlC0
> 
> / # cat /proc/asound/devices
>   0: [0- 0]: ctl

Looks OK.

What is the output of "strace amixer -c0 controls"?


Regards,
Clemens


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Re: amixer issues

[Adrian McMenamin]

On Wed, 2006-04-05 at 10:36 +0200, Clemens Ladisch wrote:
> Adrian McMenamin wrote:
> > On Tue, 2006-04-04 at 18:17 +0200, Clemens Ladisch wrote:
> > > Adrian McMenamin wrote:
> > > > / # amixer -c 0
> > > > Invalid card number.
> > > > Usage: amixer <options> command
> > > 
> > > Does /dev/snd/controlC0 exist, and does it point to the control device
> > > listed in /proc/asound/devices?
> > 
> > / # ls -l /dev/snd
> > crw-rw-rw-    1 root     sys      116,   0 Apr  4 19:13 controlC0
> > 
> > / # cat /proc/asound/devices
> >   0: [0- 0]: ctl
> 
> Looks OK.
> 
> What is the output of "strace amixer -c0 controls"?

I have no strace. This is uclibc on SH4 embedded



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