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

[Tanu Kaskinen]

On Mon, 2014-09-08 at 12:05 +0200, David Henningsson wrote:
> 
> 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?

Yes it does! Thanks, I'll write a patch for removing
analog-output-desktop-speaker.

-- 
Tanu