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

[Stefan Oltmanns]

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?