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

[David Henningsson]

On 2014-09-07 14:39, Tanu Kaskinen wrote:
> On Fri, 2014-08-22 at 12:11 +0200, David Henningsson wrote:
>>
>> On 2014-08-20 12:17, Tanu Kaskinen wrote:
>>> On Tue, 2014-08-19 at 17:05 +0200, David Henningsson wrote:
>>>>
>>>> On 2014-08-19 12:09, Tanu Kaskinen wrote:
>>>>> "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".
>>>
>>> My patch is made with the assumption that analog-output should be
>>> suppressed always when there there are more specific paths available,
>>> with the exception of analog-output-mono (the patch removes also the
>>> "Master Mono" element from analog-output, but as I said earlier, that
>>> was a mistake). Based on this discussion, it seems that you either
>>> disagree with that basic assumption, or weren't properly aware of that
>>> assumption. If you think that the assumption is bad, I'd like you to
>>> give an example where that assumption causes breakage.
>>
>> The question is if there ever can be the combination of e g
>> analog-output-headphones and analog-output, when analog-output is
>> controlling something we did not foresee, but still might be useful to
>> control.
>> But since I was unable to come up with a good example, feel free to go
>> ahead and remove the two headphone elements and sync Desktop Speaker
>> with analog-output-speaker.
>
> Sorry for a late reply, but I didn't notice the last point that you made
> until now. Why should I sync analog-output's Desktop Speaker with
> analog-output-speaker, as opposed to removing Desktop Speaker from
> analog-output? If the Desktop Speaker element exists, then the
> analog-output-desktop-speaker port will be created, and since that's
> more specific than analog-output, analog-output should be suppressed.
> Therefore, there's no reason for analog-output to care about Desktop
> Speaker.

Ok, now I had a look in the kernel. The "Desktop Speaker" name is only 
used in USB drivers. It seems very unlikely that such a USB device would 
have both "Desktop Speaker" and "Speaker", so then I suggest that we 
remove the desktop-speaker path, mark "Desktop Speaker" as required-any 
for the speaker path, and remove it from the analog-output path. Does 
that make sense?

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