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

[Stefan Oltmanns]

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?

Best regards
Stefan