[alsa-devel] [Alsa-devel] [i8x0] docking station audio-out ceased to work

[Takashi Iwai]

At Wed, 28 Mar 2007 20:31:37 +0200,
Andreas Happe wrote:
> 
> On Mon, 2007-03-26 at 12:28 +0200, Takashi Iwai wrote:
> > At Mon, 26 Mar 2007 12:07:38 +0200,
> > Andreas Happe wrote:
> > > 
> > > On Mon, 2007-03-26 at 11:55 +0200, Takashi Iwai wrote:
> > > > Copying to Linus kernel may work in most cases but sometimes not since
> > > > alsa-kernel repo is updated for mm tree.
> > > 
> > > So building a -mm kernel would also work?
> > 
> > This should work always (otherwise send bug reports :)
> 
> Booting with 2.6.21-rc4-mm1 didn't solve the alsa problem (with or
> without the aclink module parameter).

What did you try exactly?

> I start to believe that some
> change in alsa-utils/lib made the audio output stop working.

Hm, I think it's unlikely.
If it's ICH4 or newer, it has a separate SPDIF output slot in the
contoller side.  Thus, when aclink_spdif = 0 (or not given), the
dedicated DMA has to be used to send to AC-link slot 10/11.
It's usually done by playing on "spdif" PCM, such as

	% aplay -D spdif foo.wav

This is set in ICH register 0x2c (GLOB_CNT) bits SPDIF_XX.

Takashi