Re: [Alsa-devel] DXS broken with some cards in 1.0.X in module snd-via82xx?

[Maggio]

Sergey Vlasov wrote:

On Mon, Mar 01, 2004 at 03:00:41PM +0100, Maggio wrote:
 

I was just wondering if the DXS support in 1.0.X has broken the 
DXS_SUPPORT=1 with some cards .

I have an Abit KV7 Motherboard , and I use snd-via82xx for sound .

I use this module from the version "0.9.8" , and I've never had any 
problems in enabling "dxs_support=1" with the 0.9.X series of the 
drivers , yesterday , by trying 1.0.2c and today the 1.0.3 versions of 
the kernel modules , I've noticed that ALSA doesn't work anymore with 
DXS_SUPPORT=1 , because the sound is garbled  , and I can only use DXS 
with DXS_SUPPORT=4 .

What's up?
   

I suspect that dxs_support=4 is really the correct value in most (if
not all) cases.  The resampling engine in VT82xx has a register for
the source sample rate, but does not have any register to indicate
the destination sample rate.  Unless the controller snoops the AC'97
accesses in some way, this probably means that the destination
sample rate is fixed at 48000 Hz.  I'm not sure what really happens
when the codec is set to VRA mode in this case - probably this
depends on quirks of a particular codec.  On my ASUS A7V8X (VT8235
and ALC650) both dxs_support=1 and dxs_support=4 seem to work
fine...
 

dxs_support=4 works well for me in any cases , with 0.9.8 I don't hear 
(apparently) any difference between dxs_support=1 and dxs_support=4 , 
but with  1.0.2c/1.0.3 for me dxs_support=1 is pretty unusable , because 
of garbaged sound . I've just noticed that if I enable first 
dxs_support=4 , and then "rmmod" the driver , and then again reloading 
the driver with dxs_support=1 I get garbaged sound also with 0.9.8 . 
This is very obscure to me ...

I don't anyway completly understood how NO_VRA works and what this do , 
and what you lose what using NO_VRA instead of  VRA .

Thanks

Marcello

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