[Alsa-user] "Invalid CTL" error when using amixer

[Zhou P. <zho...@ya...>]

Hello all,

I'm using alsa 1.0.8 on kernel 2.6.10 with a simple ramdisk built by
myself. The modules are inserted without any errors and I could find
correct information from /proc/asound/cards. The contents of
/proc/asound/devices are:

 20: [0- 4]: digital audio playback
 27: [0- 3]: digital audio capture
 26: [0- 2]: digital audio capture
 25: [0- 1]: digital audio capture
 16: [0- 0]: digital audio playback
 24: [0- 0]: digital audio capture
  0: [0- 0]: ctl
 33:       : timer

I created the device nodes (controlC0D0, pcmC0D0p, pcmC0D2c,
pcmC0D4p, pcmC0D0c, pcmC0D1c, pcmC0D3c, timer) under /dev/snd
according to this list.

I then try to use amixer to adjust the volumes:
./amixer -D hw:0,0
It reported following errors:
ALSA lib control.c:739:(snd_ctl_open_noupdate) Invalid CTL hw:0,0
amixer: Mixer attach hw:0,0 error: No such file or directory
I also copied configuration files (alsa.conf etc.) according to
Fedora 3, but still got the same error.

However, when I install the same kernel and modules on a Fedora 3
system, everything works fine. So I think this may be caused by some
missing config files or device nodes.

Does anyone have any idea about it? Thanks!

Best regards,
Zhou Ping.



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