[alsa-devel] Intel HDA / ca0132: Multichannel + S/PDIF support

[Dylan Reid]

On Sat, Jan 3, 2015 at 2:43 AM, Stefan Oltmanns <stefan-oltmanns at gmx.net> wrote:
> Am 03.01.2015 um 02:30 schrieb Dylan Reid:
>> On Tue, Dec 30, 2014 at 8:05 AM, Stefan Oltmanns
>> <stefan-oltmanns at gmx.net> wrote:
>>> Hi,
>>>
>>> I own a Gigabyte G1.Sniper M3 Z77 mainboard with ca0132 onboard audio.
>>> Currently only stereo out and headphone out (at the back, always same
>>> signal) work by default.
>>> I was able to fix S/PDIF out by changing the headphone pin in function
>>> ca0132_config to something below 0x0d, like:
>>>
>>> spec->out_pins[1] = 0x0a;
>>>
>>> No idea why this fixes S/PDIF, but no other effects noticed. No idea if
>>> it´s going to break something on other devices. Original value is 0x10.
>>>
>>> In this function also 3 DACs are listed. The board has a total of 5
>>> stereo outputs:
>>>
>>> -Frontpanel (HDA pin connector on mainboard)
>>> 4x 3,5mm output at backpanel:
>>> -Stereo out
>>> -Headphone out
>>> -Rear out
>>> -Center/LFE out
>>>
>>> I tried to increase the number of channels and create additional outputs
>>> and connected to the other DACs. The maximum I´m able to is to get
>>> different signals out of stereo out and front headphone (not useful,
>>> just some weird mixes) or same signal from all 3 outputs. Rear and c/lfe
>>> out always no signal.
>>>
>>> During initialization snd_hda_parse_pin_def_config is called and two
>>> outputs are found. I tried to override that and change spec->autocfg
>>> after that function is called, no success.
>>> Also no matter what I change there, a little later I get this kernel
>>> messages:
>>>
>>> kernel: [    2.642972] input: HDA Intel PCH Line Out as
>>> /devices/pci0000:00/0000:00:1b.0/sound/card0/input8
>>> kernel: [    2.643142] input: HDA Intel PCH Front Headphone as
>>> /devices/pci0000:00/0000:00:1b.0/sound/card0/input7
>>> kernel: [    2.644932] input: HDA Intel PCH Line as
>>> /devices/pci0000:00/0000:00:1b.0/sound/card0/input6
>>> kernel: [    2.645050] input: HDA Intel PCH Mic as
>>> /devices/pci0000:00/0000:00:1b.0/sound/card0/input5
>>>
>>> I could not find the code where this messages are generated, where is that?
>>>
>>> Any ideas what I could/should try to get multichannel support working?
>>> Is there any kind of documentation on the ca0132 that could be helpful?
>>
>> A lot of these capabilities need to be exposed by the DSP on the
>> ca0132.  What firmware are you loading on it?
>
> I tried the one included and none, makes no difference for that problem.
> Also the firmware gets loaded after all the input/output configuration,
> you´re sure the firmware is needed for multichannel support? Is it
> possible/legal to extract it from the windows driver somehow?
>

I'm not sure you need the DSP to do this.  You could try the widows
firmware, but I don't think the driver will know how to communicate
with it.
Sorry I don't have anything more encouraging.

>
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