Re: AC3 Passthru on SB Live

[Takashi Iwai <tiwai@suse.de>]

At Wed, 27 Feb 2002 15:50:47 -0000,
James Courtier-Dutton wrote:
> 
> Hello
> 
> AC3 passthru on the SB Live does not seem to work on all platforms with the
> latest alsa-cvs. (26-2-2002)
> It works on my system, which is a SB Live Rev 6, which only started working
> recently.

Just curious - are you using a kernel with HIGHMEM config?
If working with this config, then it should not be a problem of memory
allocation.
Or, it might be the problem of dma mask.  ALSA uses 31bit mask while
Creative's driver uses 29bit.  But anyway this won't affect unless you
have more than 512MB RAM and kernel ocasionally allocates the area
greater than 512MB.


> It does not work on a SB Live rev 7 (I don't have this, but others have
> reported.)

IIRC, we still don't implement the direct pass-through method (PASS2
in Creative's driver) for the recent models (rev.7 or newer).
Perhaps this makes difference.


Takashi

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