[Alsa-user] Re: c-media: CMI8738 SPDIF problem

[Christoph R. <ch...@mv...>]

Hi Takashi Iwai!

Now I tried it with the right command(% aplay -d2 test.wav) but it hangs and I 
have to close the shell. During the hang my MD-recorder records because it 
thinks there is a signal (the volume bar fo the MD-recorder says nothing so 
the signal must be very silent). When I close the shell AFTER the .wav is 
finished and I want to retry it later the aplay says "Device or resource buys".

I used all the different possibiltys (SPDIF Out To DAC, in phase inverse, ...) 
but the result was the same.

Which command shut I use to make the dump during the SPDIF playback?

Ciao. Chris.



Quoting Takashi Iwai <ti...@su...>:

> Hi Chris,
> 
> At Mon, 28 Jan 2002 17:22:01 +0100 (CET),
> ch...@mv... wrote:
> > 
> > Hi Takashi Iwai.
> > 
> > I still have a problem with the SPDIF output of my soundcard.
> >
> 
--------------------------------------------------------------------------------
> > infos:
> > I use ALSA from SUSE 7.3
> > c-media: 8738
> > model number 39
> > vendor: Zoltrix (Nightingale Pro 6)
> > dump of /proc/asound/card1/cmipci:
> > C-Media PCI
> > 
> > 00: 02 00 00 00
> > 04: 00 0c 00 00
> > 08: 03 00 29 00
> > 0c: 00 00 00 07
> > 10: c0 00 00 40
> > 14: 00 00 20 00
> > 18: 00 00 00 00
> > 1c: cf ad fa fd
> > 20: 10 40 e0 00
> > 24: 02 01 00 00
> > 28: ff ff ff ff
> > 2c: ff ff ff ff
> > 30: 22 64 40 80
> > 34: 00 00 00 00
> > 38: 00 00 00 00
> > 3c: 00 00 00 00
> > 
> > If you need more infos please ask.
> 
> I guess the registers above were not dumped during spdif playback.
> Right?
> 
> >
> 
--------------------------------------------------------------------------------
> > 
> > When I want to play sound through the SPDIF there isn't a signal. No,
> the
> > signal (red light) is, but there is no volume. Instead I hear sound on
> the
> > analog speakers. Here is the log:
> > 
> >
> 
--------------------------------------------------------------------------------
> > %> aplay -dhw:0,2 test.wav
> > Aplay: version 0.5.10 by Jaroslav Kysela <pe...@su...>
> > Using soundcard 'C-Media PCI CM8738 (model 39) at 0xc400, irq 17'
> > Playing WAVE 'test.wav' : Signed 16-bit Little Endian, Rate 44100 Hz,
> Stereo
> >
> 
--------------------------------------------------------------------------------
> 
> The syntax of aplay is different between ALSA 0.5.x and 0.9.0.
> For 0.5.x, use -d option to specify the device number, i.e.
> 
>  % aplay -d2 test.wav
> 
> 
> > Only when I enable the SPDIF "DAC to OUT" I get a very loud distorted
> sound.
>  
> Please turn off "DAC to Out" for the time being.
> It's a mixture of analog streams and looks not suitable for the recent
> chips.
> 
> At first please try to turn only "SPDIF Output Switch" on and other
> SPDIF-related switches off.  If still not work, please try to turn on
> both  "SPDIF Output Switch" and "SPDIF Out To DAC" (not "DAC to
> Out").
> 
> 
> > p.s. Does SUSE realease RPM updates for alsa or do I have to reinstall
> alsa
> > after by hand?
> 
> Basically there has no big changes in the 0.5.x serie since SuSE 7.3
> was released.  So you can keep it as long as it works :)
> 
> 
> ciao,
> 
> Takashi
>