[pulseaudio-discuss] [PATCH 2/2] alsa-mixer: Ignore some elements in the analog-output path

[David Henningsson]

On 2014-08-19 12:09, Tanu Kaskinen wrote:
> On Tue, 2014-08-19 at 07:47 +0200, David Henningsson wrote:
>>
>> On 2014-08-17 13:52, Tanu Kaskinen wrote:
>>> The analog-output path should be suppressed when there are more
>>> specific paths available. Currently that usually doesn't happen. The
>>> suppression can be done with the path subset detection, and this patch
>>> makes that work (another approach would be to mark the elements as
>>> required-absent, like analog-input does, but I like the subset
>>> suppression more, because it requires less stuff in the configuration
>>> files). The problem with listing the now-removed elements in
>>> analog-output.conf was that if the sound card had e.g. a Speaker
>>> element, then the switch behaviour was different between analog-output
>>> and analog-output-speakers, so analog-output was not considered a
>>> subset of analog-output-speakers.
>>
>> Removing the "Jack" ones should be okay, because they're required-any in
>> lineout.conf, so if these elements exist, there is always a "Line Out".
>>
>> I'm not sure about removing the elements. Could there be hardware where
>> we don't have anything making analog-output-speaker.conf show up, and we
>> still want the control over the things you remove below in
>> analog-output.conf?
>
> Could you be more specific? If there's nothing that makes
> analog-output-speaker show up, then which of these do you think we might
> want to control in analog-output: "Line HP Swap",

Apparently added by myself in 2011, for a reason (needed by Dove 
boards). So removing this one will regress that board. This one is quite 
unusual so I bet keeping it wouldn't cause any unnecessary duplicates I 
think.

> "Headphone",
> "Headphone2",

Arun changed the behaviour of these in 2013, before they behaved the 
same. I'm not really sure what to do here. It seems reasonable to keep 
them enabled for analog-output and muted for analog-output-speaker.

> "Desktop Speaker"?

AFAICR, I've never seen "Desktop Speaker". I think we can synchronise 
the behavior so that it is the same on "analog-output" and 
"analog-output-speaker".

-- 
David Henningsson, Canonical Ltd.
https://launchpad.net/~diwic