[pulseaudio-discuss] [PATCH] Alsa: Correct port availability with multiple jacks

[Sjoerd Simons]

On Tue, 2014-10-28 at 12:10 +0200, Tanu Kaskinen wrote:
> On Tue, 2014-10-28 at 05:30 +0100, David Henningsson wrote:
> > 
> > On 2014-10-24 22:33, Sjoerd Simons wrote:
> > > In case there are two independent jacks for one port (e.g. Dock
> > > Headphone Jack and Headphone Jack), the availability ends up being
> > > incorrect for one of the first was _NO (not plugged) and the second gets
> > > _YES (plugged). Also pulse complains about the state being inconsistent
> > > which isn't true.
> > >
> > > Fix this by preferring higher states (_YES > _NO > _UNKNOWN)
> > 
> > Thanks, I agree with this conclusion. I didn't really know what to do 
> > with one jack being yes and another being no, but the above reasoning 
> > makes sense.
> > 
> > I'm not sure I'm happy with just a simple ">" comparison - in case we 
> > add more jack states in the future, they might not fit with the ">" 
> > scheme. But maybe we should deal with that when the problem comes and 
> > just take your patch as-is now. What do other people think?
> 
> I'd prefer replacing the ">" comparison with something else too.
> 
> The use case that this patch is made for seems such that there shouldn't
> be any jack state conflict to worry about in the first place, though. To
> me "dock headphone" and "built-in headphone" seem like obviously
> separate paths, so I think we should reflect that in our configuration
> by creating a new path file.

Correct. This is specifically for cases where a path has multiple
potential equivalent output jacks.

My personal use-case is Dock headphone jack vs. built-in headphone jack,
but in principle the same could happen with Front headphone jack vs
headphone jack (dunno if those can exist in practise).

-- 
Sjoerd Simons <sjoerd at luon.net>