Re: ALC655 in CVS: Are Center/LFE switched with Surround?

[Richard Chan <rspchan@starhub.net.sg>]

Alas, the new VIA82XX.conf doesn't fix the problem.
(ALC655 does not have the "Slot Modify" feature of ALC650).
Also I realise I still need a plug with slave.channels 6

If I use surround51 directly I cannot get sound out of the other
four speakers. This plug gives me rear sound

pcm.testrear {
        type plug
####Aargh!! should be ttable.0.2 and ttable.0.3####
####Changing Swap Surround Slot doesn't help###
####ALC655 does not have Slot Modify control bits in register 6A###
        ttable.0.4  1
        ttable.1.5  1
        slave.pcm surround51
        slave.channels 6
}

(I notice surround50.conf has the slave channels set; can something similar
be put inside surround51.conf?)

xine will also not product surround sound with the surround51 device -
I need to use a plug with channels set to 6.

Funny though mplayer works with the surround51 device (though
channels are swapped).


Takashi Iwai wrote:

>At Wed, 19 Nov 2003 23:04:57 +0800,
>Richard Chan wrote:
>  
>
>>I've finally got 5.1 out of my via82xx/ALC655 system using the 
>>Line-In/Mic jacks!
>>Thanks Takashi.
>>    
>>
>
>glad to hear that it works now.  what was the problem?
>
> 
>  
>
>>However I seem to have got Center/LFE switched with Surround.
>>I.e. if I play xine & mplayer (L, R, RearL, RearR, Center, LFE)
>>through surround51 I get Center/LFE switched with Rear speakers.
>>    
>>
>
>ah, this reminds me an old story.
>there is a mixer switch "Swap Surround Slot".  and, IIRC, starngely
>enough, for 5.1 this should be turned on for 5.1 output while it's off
>for 4.0.
>
>  
>
>>I must use the following to work in .asoundrc
>>pcm_slave.sltest {
>>    pcm "hw:0,1"
>>    channels 6
>>}
>>
>>pcm.via51 {
>>    type plug
>>    ttable.0.0  1
>>    ttable.1.1  1
>>    ttable.2.4  1
>>    ttable.3.5  1
>>    ttable.4.2  1
>>    ttable.5.3  1
>>    slave sltest
>>}
>>    
>>
>
>this is also a solution, but the attached would be more "light" way.
>copy the attached file to /usr/share/alsa/cards.
>also, if you have chance, please test 4.0 output, too.
>
>
>thanks,
>
>Takashi
>  
>
>------------------------------------------------------------------------
>
>
>  
>




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