AD1986a

AD1986a

[Arnaud Patard]

Hi,


I have the same problem as
https://bugtrack.alsa-project.org/alsa-bug/view.php?id=1678

I though that it was only a matter of how the hda verbs were initialised
so I made a patch allowing to change the channel configuration
(http://people.mandriva.com/~apatard/ad1986a_2channel_mode_fix.patch).
Unfortunately, this was not enough. 

Today, I've added this patch
http://people.mandriva.com/~apatard/dont_copy_front.patch which is
working but it's rather something ugly.

Moreover, I'm only able to test this with two speakers, so I don't know
if these patches are working with 4 or 6 channels setups.


Any hint on how to debug and fix this bug ?

Regards,
Arnaud



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Re: AD1986a

[Takashi Iwai]

At Wed, 04 Jan 2006 19:22:21 +0100,
Arnaud Patard wrote:
> 
> Hi,
> 
> 
> I have the same problem as
> https://bugtrack.alsa-project.org/alsa-bug/view.php?id=1678
> 
> I though that it was only a matter of how the hda verbs were initialised
> so I made a patch allowing to change the channel configuration
> (http://people.mandriva.com/~apatard/ad1986a_2channel_mode_fix.patch).
> Unfortunately, this was not enough. 

This patch looks fine.

> Today, I've added this patch
> http://people.mandriva.com/~apatard/dont_copy_front.patch which is
> working but it's rather something ugly.
> 
> Moreover, I'm only able to test this with two speakers, so I don't know
> if these patches are working with 4 or 6 channels setups.

Surely won't work since you disabled the signal to surrounds :)

> Any hint on how to debug and fix this bug ?

What is the exact status on your board?  Is only the front left
channel noisy or silence?  I still don't figure out how the latter
patch fixes the problem...


Takashi


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Re: AD1986a

[Arnaud Patard]

Takashi Iwai <tiwai@suse.de> writes:

> At Wed, 04 Jan 2006 19:22:21 +0100,
> Arnaud Patard wrote:
>> 
>> Hi,
>> 
>> 
>> I have the same problem as
>> https://bugtrack.alsa-project.org/alsa-bug/view.php?id=1678
>> 
>> I though that it was only a matter of how the hda verbs were initialised
>> so I made a patch allowing to change the channel configuration
>> (http://people.mandriva.com/~apatard/ad1986a_2channel_mode_fix.patch).
>> Unfortunately, this was not enough. 
>
> This patch looks fine.

okay. I'll probably wait for the noise bug to be fixed before sending it
for inclusion.

>
>> Today, I've added this patch
>> http://people.mandriva.com/~apatard/dont_copy_front.patch which is
>> working but it's rather something ugly.
>> 
>> Moreover, I'm only able to test this with two speakers, so I don't know
>> if these patches are working with 4 or 6 channels setups.
>
> Surely won't work since you disabled the signal to surrounds :)

hm.. so, I'm probably wrong but I though that this patch was only
preventing to send front signal to others DACs when a stereo sound is
playing (thus playing 5.1 sound on 5.1 systems should still work).

>
>> Any hint on how to debug and fix this bug ?
>
> What is the exact status on your board?  Is only the front left
> channel noisy or silence?  I still don't figure out how the latter
> patch fixes the problem...

Only the front left is noisy. The front right is fine. About how this is
fixing the bug, I have only guesses. I think it's a matter of codec
setup and doing this fixes it for unknown reasons. I've even noticed
that loading a module with this patch and then replacing it with the
original module was working too. It's weird :(

Arnaud



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Re: AD1986a

[Takashi Iwai]

At Wed, 11 Jan 2006 14:15:30 +0100,
Arnaud Patard wrote:
> 
> Takashi Iwai <tiwai@suse.de> writes:
> 
> > At Wed, 04 Jan 2006 19:22:21 +0100,
> > Arnaud Patard wrote:
> >> 
> >> Hi,
> >> 
> >> 
> >> I have the same problem as
> >> https://bugtrack.alsa-project.org/alsa-bug/view.php?id=1678
> >> 
> >> I though that it was only a matter of how the hda verbs were initialised
> >> so I made a patch allowing to change the channel configuration
> >> (http://people.mandriva.com/~apatard/ad1986a_2channel_mode_fix.patch).
> >> Unfortunately, this was not enough. 
> >
> > This patch looks fine.
> 
> okay. I'll probably wait for the noise bug to be fixed before sending it
> for inclusion.

OK.

> >> Today, I've added this patch
> >> http://people.mandriva.com/~apatard/dont_copy_front.patch which is
> >> working but it's rather something ugly.
> >> 
> >> Moreover, I'm only able to test this with two speakers, so I don't know
> >> if these patches are working with 4 or 6 channels setups.
> >
> > Surely won't work since you disabled the signal to surrounds :)
> 
> hm.. so, I'm probably wrong but I though that this patch was only
> preventing to send front signal to others DACs when a stereo sound is
> playing (thus playing 5.1 sound on 5.1 systems should still work).

Yes, if you meant so, it's correct.  I interpreted the above as a
typical bugreport "hearing no sounds from surrounds when I play mp3"
:)

> >
> >> Any hint on how to debug and fix this bug ?
> >
> > What is the exact status on your board?  Is only the front left
> > channel noisy or silence?  I still don't figure out how the latter
> > patch fixes the problem...
> 
> Only the front left is noisy. The front right is fine. About how this is
> fixing the bug, I have only guesses. I think it's a matter of codec
> setup and doing this fixes it for unknown reasons. I've even noticed
> that loading a module with this patch and then replacing it with the
> original module was working too. It's weird :(

Hm, this sounds like rather a some bug in the hardware.
I'll try to ask AD about this...


Takashi


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