[alsa-devel] Separate input and output jacks for one UCM device?

[Raymond Yau]

> >
> > > > The theory is that this is handled by the fact that the userspace
ABI
> > > > includes a reference to the struct device and therefore a chain
showing
> > > > where the thing is attached; anything registering two different
jacks
> > > > with the same name attached to the same device probably qualifies as
> > > > broken.
> >
> > > So this implicitly assumes the name uniqueness.  For HD-audio, this
> > > was a problem because we need to generate jack names dynamically; for
> > > example, there are laptops with two headphones, and we assigned
> > > indices in such a case.
> >
> > That's on the same card, though?
>
> Yeah, on the same laptop, even both on the front.  The designer must
> have smoked, or just looked for a partner sitting at next to listen to
> music together :)

http://en.community.dell.com/support-forums/laptop/f/3517/t/19440542

One of the headphone jack is actually headphone/SPDIF combo jack

and the two headphone jacks and mic jack can support surround 5.1