[alsa-devel] alsactl adds volume controls?

Raymond Yau superquad.vortex2 at gmail.com
Sat Oct 2 02:51:53 CEST 2010

2010/9/3 Jaroslav Kysela <perex at perex.cz>

> On Fri, 3 Sep 2010, David Henningsson wrote:
> > What would be really helpful would be if snd_mixer_open() took an
> > optional pcm handle, and then only returned the mixer controls that
> > affects the signal path of that pcm.
> This will be solved by another mechanism like ucm (use case manager). The
> idea is to return the PCM handle and associated mixer controls (master +
> pcm) for specified use case (like hdmi output etc.).
>                                        Jaroslav
How about those [Volume Knob Widget] , can the driver read back the step or
dB of the volume knob from the codec ?

Node 0x24 [Volume Knob Widget] wcaps 0x600000: Mono
  Volume-Knob: delta=1, steps=127, direct=0, val=127
  Connection: 4
     0x02 0x03 0x04 0x05

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