[alsa-devel] [PATCH 0/30] ALSA: HDA VIA: patch series

[Takashi Iwai]

At Sun, 11 Oct 2009 10:56:48 -0600,
Robert Hancock wrote:
> 
> On Sun, Oct 11, 2009 at 10:18 AM, Takashi Iwai <tiwai at suse.de> wrote:
> > At Sat, 10 Oct 2009 19:07:09 +0800,
> > Logan Li wrote:
> >>
> >> Following patch series mainly includes:
> >>  - support VT1718S, VT2002P, VT1812S, VT1716S, ...
> >>  - support smart 5.1
> >>  - add jack detection for VT1708
> >>  - power saving functions
> >
> > Thanks for the patches.  They are all well formatted now.
> >
> > I applied your patches except for 17,
> >        ALSA: HDA VIA: Add 2nd S/PDIF out for VT1708S and VT1702
> > as Robert reported a regression.
> >
> > This is likely because of the behavior change by this patch.  Now
> > the second SPDIF has to be specified manually with the explicit
> > substream number.  This itself is fine, but I see the problem with
> > pulseaudio, for example.  There is no good way to specify this substream
> > automatically for PA with some symbols like "spdif" or "hdmi".
> >
> > This is basically a problem of the current ALSA core and HD-audio core
> > implementation.  So, we should solve all together.
> 
> Actually, the latest posted version didn't have the mixer problem I
> had before (I haven't looked in detail at what was different). But I
> agree using a different substream for a different output isn't ideal
> since there's no way for software to detect that this is the case. Can
> it be a separate PCM like hw:0,2 or something?

It would work like hw:0,1,1.  But, this is exactly what I mentioned in
the above.  The secondary SPDIF isn't specified as an intuitively
selectable PCM device.

> Hopefully VIA will also look into the SPDIF no-output problem I have
> with VT1828S..

What is the problem, specifically?


thanks,

Takashi