[alsa-devel] Exposing the ThinkPad HW mute switch to ALSA?

[Takashi Iwai]

At Tue, 7 Oct 2014 17:25:13 +1100,
Grant Diffey wrote:
> 
> so I have a really dumb question.
> 
> Why can't the controls be mapped as HCI rather than a soundcard? given
> there's no audio production capability here only a control capability.
> 
> Also this seems to be how they end up functioning on a modern system they
> get bound to pulse which remaps them to whatever's 'active'
> 
> Why does everyone say that this is a soundcard when it's really a keyboard
> (from my pov)

thinkpad_acpi actually mutes the sound on some models, at least the
old ones, independently from the sound chip mute state.  That's why it
was implemented as the sound card object initially.


Takashi