Re: VIA 8233A, 8235 with ALC650 codec

[Takashi Iwai <tiwai@suse.de>]

At Tue, 18 Feb 2003 07:43:26 +0300,
Anton Worshevsky wrote:
> 
> Dear Takashi Iwai,
> 
> Monday, February 10, 2003, 12:14:59 PM, you wrote:
> 
> >> When I changed VIA_REV_8233A to TYPE_VIA8233A my onboard soundcard
> >> (VIA8233A + ALC650) works (2 channel, 4 cannel).
> >>
> >> 5.1 has problem - swaped channels. (LF, RF, Center - OK, LS - Woofer,
> >> RS - LS, Woofer - RS.
> 
> TI> which program are you using?
> 
> TI> please check the ac97 register 0x6a in /proc/asound/card0/ac97#0regs
> TI> and whether the bits 30-31 (zero-based) are off.
> 
> Do you mean bit 14-15 ?

yep :)

> As i posted before, i have similar channel swapping with VIA8235 + ALC650.
> If bits 14-15 (slot modify) set to 0 - channels has incorrect placement.
> It can be fixed by exchanging Rear and Center/LFE jacks.
> When i set bit 14 to 1 - OK
> Surely via8235 transmit multi-channel data in AC-Link in 3,4,6,9,7,8 order,
> instead of 3,4,7,8,6,9 as specified in AC97.
> I switch codec to 3,4,6,9,7,8 mode by setting bit 14 with following patch
> in attachment for ac97_patch.c.

well, then your investigation may be correct.  i have also no
datasheet regarding this.
i'll ask VIA guys whether the correct order is 3/4/6/9/7/8 or
3/4/7/8/6/9.


ciao,

Takashi


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