Re: mm snapshot broken-out-2007-03-05-02-22.tar.gz uploaded

[Randy Cushman]

Takashi Iwai wrote:
> At Thu, 8 Mar 2007 17:52:43 +0100,
> Michal Piotrowski wrote:
>   
> > On 08/03/07, Takashi Iwai <tiwai@xxxxxxx> wrote:
> >     
> > > At Thu, 08 Mar 2007 16:42:26 +0100,
> > > Michal Piotrowski wrote:
> > >       
> > > > > Also, it'd be helpful if you compare
> > > > > /proc/asound/card0/codec97#0/ac97#0-0+regs file before and after the
> > > > > patch.  This reveals which register bits differ actually.
> > > > >           
> > > > a2.txt is form 2.6.21-rc3 witchout 831466f4ad2b5fe23dff77edbe6a7c244435e973
> > > >
> > > > diff -uprN a2.txt /proc/asound/card0/codec97#0/ac97#0-0+regs
> > > > --- a2.txt      2007-03-08 16:36:47.000000000 +0100
> > > > +++ /proc/asound/card0/codec97#0/ac97#0-0+regs  2007-03-08 16:36:49.447083597 +0100
> > > > @@ -56,8 +56,8 @@
> > > >  0:6e = 0000
> > > >  0:70 = 0000
> > > >  0:72 = 0004
> > > > -0:74 = 1001
> > > > -0:76 = 64a4
> > > > +0:74 = 1201
> > > > +0:76 = 7ca4
> > > >  0:78 = 000c
> > > >  0:7a = 0000
> > > >  0:7c = 4144
> > > >         
> > > OK, some wrong bits there.  Could you try the patch below?
> > >       
> > Problem fixed. Thanks!
> >
> > (speaker-test -c6 -Dplug:surround51 is still broken)
> >     
>
> Hm, how about turning off "Spread Front To..." control and run
> speaker-test?
>
>
> Takashi
>
>
>   
Michal and Takashi,

I've been researching your issue this morning.  I just noticed that your 
exchange had ensued.

I configured my AD1986-based system as closely as I could to match your 
AD1985 mixer settings.  In doing so, I experienced results similar to 
what I'm assuming you described:  Only front channel sound came out of 
the surround and c/lfe jacks.

Here is what I had to change to get the appropriate multichannel sound:

1) The command "speaker-test -c6" does not work on my system.  I have to 
use "speaker-test -Dsurround51 -c6"  (Perhaps this is related to running 
an old version of speaker-test.)

2) I disabled "Spread Front to Surround and Center/LFE"

The explanation for 2) is this:  There can be only one source for each 
of the Surround and Center/LFE jacks active at one time.  When "Spread 
Front to Surround and Center/LFE" is disabled, the surround channels go 
to the the jacks; when this control is enabled, ONLY the front channels 
go to the surround and c/lfe jacks.

Considering the register values Michal provided and Takashi's patch:

The logic of the code is as follows:  (Slightly simplifying,) functions 
is_shared_linein() and is_shared_micin() return TRUE if the mixer is 
configured for shared jacks AND NOT for 6 channel mode.  In this case it 
is appropriate to
set these bits (LODIS and CLDIS).

Please double-check your mixer settings.  I added a byte to a structure, 
so the mixer settings can get messed up switching between alsa-kernel 
versions.

I don't understand why the other bit (OMS, 0x74 bit D9) is set.  This 
may have been an oversight on my part.

I am modifying alsa-kernel to run as an AD1985 on my system, to try to 
check these bits.

Randy Cushman


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