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

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Date:	Thu, 08 Mar 2007 12:05:49 -0500
From:	Randy Cushman <rcushman_linux@...thlink.net>
To:	Takashi Iwai <tiwai@...e.de>,
	Michal Piotrowski <michal.k.k.piotrowski@...il.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Jaroslav Kysela <perex@...e.cz>, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Adrian Bunk <bunk@...sta.de>
Subject: Re: mm snapshot broken-out-2007-03-05-02-22.tar.gz uploaded

Takashi Iwai wrote:
> At Thu, 8 Mar 2007 17:52:43 +0100,
> Michal Piotrowski wrote:
>   
>> On 08/03/07, Takashi Iwai <tiwai@...e.de> 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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