[pulseaudio-discuss] Configuring alsa mixers in the "off" profile.

[Matti J. Aaltonen]

On 10/06/2011 04:34 PM, ext Mark Brown wrote:
> On Thu, Oct 06, 2011 at 04:22:33PM +0300, Matti J. Aaltonen wrote:
>
>> But the handling of the analog audio isn't that straightforward, or
>> maybe it is... I'm not familiar with pulse audio.
> It's trivial and can be done entirely in kernel as with all the other
> audio power management.
>
>> Earlier versions of lankku had analog audio output connected to the
>> headphone amplifier, turning that amp on could also turn on the
>> radio. But that amplifier could be turned on for other reasons as
>> well. How to identify that it is to be used to amplify the signal
>> from the radio... Also are "we" trying to find a solution for a
>> particular use case (Lankku doesn't have analog audio possibility
>> for the radio) or an up-streamable more general solution?
> All the audio power management flows from audio routing - when you
> disconnect the audio path that connects the FM radio from an output then
> all elements of that path will be powered down (assuming they aren't
> also used by other paths).

I understand that in the normal digital case. But I'm now kind of 
fixated to this one example that I've seen.
In this case we have some alsa devices that behave like you describe 
above. But then we have an analog amplifier that's connected to
to DAC and to the analog radio, the wires are simply soldered to the 
amplifier inputs.

What you suggest is that we need "dummy" codec for the analog radio so 
that we can have it as another audio card in the system...? Now it's 
starting to sound better.