[alsa-devel] Sampling rate limited to 48 kHz

[Marek Ławicki]

2007/4/4, Takashi Iwai <tiwai at suse.de>:
> At Tue, 3 Apr 2007 21:49:08 +0200,
> =?ISO-8859-2?Q?Marek_=A3awicki?= wrote:
> >
> > 2007/4/3, Takashi Iwai <tiwai at suse.de>:
> > > At Mon, 2 Apr 2007 23:44:53 +0200,
> > > =?ISO-8859-2?Q?Marek_=A3awicki?= wrote:
> > > >
> > > > Hi,
> > > >
> > > > I have Turtle Beach Catalina Card (Envy24HT-S, VT1616 + WM8728)
> > > > which I belive is exactly the same as Mad Dog Entertainer 7.1
> > > > ( http://techreport.com/reviews/2004q1/maddog-entertainer/index.x?pg=2 )
> > > >
> > > > Card is recognized as Chaintech AV-710 but works very well
> > > > ( so far I tested analog out through WM8728 and digital out ).
> > > >
> > > > My problem is : I can't set sampling rate higher than 48000 on SPDIF out.
> > >
> > > How did you test it?  Which program and which parameters?
> > > ice1724 driver itself supports up to 192kHz for SPDIF output.
> > >
> > >
> > > Takashi
> >
> > Hi,
> >
> > alsamixer - impossible to set "Multi Track Internal Clock" beyond 48000
>
> Well, then it's because the EEPROM content is somehow strange.  It
> doesn't indicate that it has I2S connection.  I guess it's because the
> board has both ac97 and I2S codecs.  It's an interesting case.
> We'd first need to figure out the connections of these codecs.
>
> When you use amp.c as it is, how well does the card work?
> I guess you having some mixer elements like "Master", "PCM", etc.
> They come from ac97 (vt1616).  The driver creates no mixer elements
> for WM8728 on the other hand.
>
> So, the question is, when you change "Master" or "PCM", which output
> (front, surround, clfe, side) is affected?
>

Hi,

As on this photo http://support.turtlebeach.com/site/kb_ftp/586117719.asp
from the left :

1. Front Out (Channels 1/2) :

Vol reg : Master, PCM

2. Rear Out (Channels 3/4) :

Works only with "Alternate Level to Surround Out" set to [on]
Vol reg : Headphone, PCM

3. Center/Sub Out  (Channels 5/6) :

Couldn't get sound at all.

4. Surround Out (Channels 7/8) :

Works only with "IEC958" _not_ set to "PCM Out"

Vol reg : PCM

> Also, when you change the values in wm_inits[] in
> snd_vt1724_amp_init(), especially, the values for WM_ATTEN_L and
> WM_ATTEN_R to other values, say, 0x20 (-16dB), which outputs are
> affected?
>


Recompiled modules with WM_ATTEN_L and WM_ATTEN_R set to 0x0020.
Played some music.
Unloaded original modules (/etc/init.d/alsasound stop)
Replaced /lib/modules/2.6.18.6/alsa-driver
Loaded newly compiled modules (/etc/init.d/alsasound stop)
Played some music.
All channels sounded the same.

Regards,
Marek.