Re: VIA VT8237

[R CHAN <rspchan@starhub.net.sg>]

I think Gert is referring to Rear L/R switched with Center/LFE
rather than Center<->LFE; indeed I have encountered exactly the
same problem myself.

[The windows test setup program allows Center<->LFE to be adjusted
but outputs Rear L/R "correctly"; I'm not sure why Alsa has got
it the other way round - maybe I need 3,4,6,9,7,8]?


Anthony Dominic Truong wrote:
> This is a new feature in this new AC97 controller.  3D Channel SGD
> Control Register (offset 0x41) is used to turn this on or off.  Writing
> a 1 to bit 4 of this register enables the swapping of center and LFE
> playbacks (slots 3,4,7,8,9,6).  Clearing this bit keeps the order
> (3,4,7,8,6,9).
> This is a bit of info I got from VIA after struggling with this swapping
> for nearly a week. :-(
> 
> Regards,
> Anthony Dominic Truong.
> 
> 
> On Wed, 2004-06-02 at 13:48, Gert Vervoort wrote:
> 
>>The following patch adds a reference to the VIA VT8237 southbridge:
>>
>>--- via82xx.c.orig      2004-06-02 22:09:04.509536136 +0200
>>+++ via82xx.c   2004-06-02 22:40:35.773020384 +0200
>>@@ -136,6 +136,7 @@
>> #define VIA_REV_8233           0x30    /* 2 rec, 4 pb, 1 multi-pb, spdif */
>> #define VIA_REV_8233A          0x40    /* 1 rec, 1 multi-pb, spdf */
>> #define VIA_REV_8235           0x50    /* 2 rec, 4 pb, 1 multi-pb, spdif */
>>+#define VIA_REV_8237           0x60    /* 2 rec, 4 pb, 1 multi-pb, spdif */
>> 
>> /*
>>  *  Direct registers
>>@@ -2070,6 +2071,7 @@
>>        { VIA_REV_8233, "VIA 8233", TYPE_VIA8233 },
>>        { VIA_REV_8233A, "VIA 8233A", TYPE_VIA8233A },
>>        { VIA_REV_8235, "VIA 8235", TYPE_VIA8233 },
>>+       { VIA_REV_8237, "VIA 8237", TYPE_VIA8233 },
>> };
>> 
>> /*
>>
>>When playing back 6 channel audio on this card, it looks like the rear 
>>left/right and center/LFE are switched.
>>
>>Gert
>>
>>
>>
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> 
> 
> 
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