Re: VT8233/A/8235 Clock Problem

[Sergey Vlasov <vsu@altlinux.ru>]

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On Mon, Dec 08, 2003 at 01:17:38PM -0800, Mark Knecht wrote:
>    This sounds encouraging. For those of us not in the know, can you tell me
> anything about *what* dxs support is? Just point me at a web site with an
> explanation if you have one. And what are dxs options 1, 2, 3 & 4 really
> doing?

Seems that the only description is what "modinfo snd-via82xx" gives...

0 (unspecified) - consult the table of known subsystem IDs to find the
real value (use 3 if the subsystem ID is not in the table).

1 - enable full support for DXS channels.

2 - disable DXS channels completely.

3 - enable DXS channels, but allow 48000 sample rate only.

4 - enable DXS channels, allow all sample rates, but don't set the rate in
the codec (always set the codec to 48000).

>    Does this 2-channel motherboard sound chip actually do hardware mixing?
> Or is that for other sound chips in this family?

VIA 8233 (but _not_ 8233A) and 8235 can do hardware mixing of 4 streams
(the streams must have the same sample rate - on the first open the
sampling rate is set, and subsequent streams cannot use anything other).

Actually the chip can support 6-channel output (usually the Mic In and
Line In jacks can be switched to work as outputs - look in alsamixer for
these options, use 'm' to toggle; however, I did not try this myself).
However, in this mode the hardware mixing of multiple streams is not
available (the second subdevice is used for 4- and 6-channel modes).

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