Re: Revo 5.1

[David Peroutka <david.peroutka@seznam.cz>]

Takashi Iwai wrote:
> At Tue, 06 Dec 2005 09:34:48 -0500,
> Trevor Feeney wrote:
> 
>>Was taking a look at the source for the Revo 5.1, noticed a few things.  
>>You set it up as using only 6 DACs, going by the 5.1 I figure, but when 
>>you consider that it also has the headpone out, it would have the same 
>>number of DACs as the 7.1 (8 DACs in all). 
>>
>>Takashi - that answers your question in the last thread...from what I've 
>>read, the 5.1 only uses one codec, and the headphones would just be a 
>>separate channel.  I tried adjusting the number of DACs to 8 in the 
>>driver, and did manage to get two
>>DAC mixer sliders.  I'm not really sure if that was the way to go or 
>>not.  I tried adjusting the asound plugin to output to 8 channels, pcm 
>>device surround71, but that didn't seem to work.  I wondering if it 
>>needs to be setup separately thant the other 6 channels so that it would 
>>be considered it's own PCM device.  That goes a bit beyond my realm of 
>>knowledge for driver development though...still trying to learn this.  
>>Been reading a lot of the documents and such.
> 
> 
> [Added alsa-devel ML again]
> 
> In the case of ice1724, you can open a stereo stream separately.
> The first PCM is assigned to the multi-channel, i.e. 2-8 channels
> interleaved format.  The secondary PCM is for SPDIF.  The third PCM is
> the "independent" streams.  This may have up to 3 substreams, each of
> which is a 2-channel one.  If you change num_dacs = 8, you'll be able
> to access plughw:0,2,3 (suppose the card# is 0) for the last two
> channels individually:
> 
> 	% aplay -Dplughw:0,1,3 foo.wav
> 
> And you have to raise the corresponding DAC mixer values, of course.
> 
> 
> Takashi

I've enabled all 8-channels of AK4358 in the driver, but I was unable to 
access the 4-th substream, because (as you noted) there are max 3 
substreams per PCM, so "plughw:0,2,3" is actually not available (the 
other substreams work fine).

I'd really like to try the 4-th substream because there is a good chance 
that it is used to drive the headphone output (I see no other chip on 
the board for headphone out).

Is there any other way to access the 4-th substream of PCM#2? Looking at 
ice1724.c I see no easy way to do that, so I'm again asking you for help :)

Thanks in advance,

David


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