I have a Gigabyte G33 motherboard with a HDMI output. I'm trying to get
audio to be delivered via HDMI (as my TV has no seperate audio input for
HDMI devices and it won't do 1080p on the DVI input).
/proc/asound/card0 has two codec files in it (codec#0 and codec#2).
codec#2 is the working sound driver. It's got the normal analog outputs
via a Realtek ALC885 et al and it's pretty boring.
codec#0 is much shorter and (to me) more interesting:
# cat codec#0
Codec: Generic 1095 ID 1392
Address: 0
Vendor Id: 0x10951392
Subsystem Id: 0xffffffff
Revision Id: 0x100000
Default PCM:
rates [0x0]:
bits [0x0]:
formats [0x0]:
Default Amp-In caps: N/A
Default Amp-Out caps: N/A
Node 0x02 [Audio Output] wcaps 0x6211: Stereo Digital
PCM:
rates [0x7f0]: 32000 44100 48000 88200 96000 176400 192000
bits [0x1e]: 16 20 24 32
formats [0x5]: PCM AC3
Node 0x03 [Pin Complex] wcaps 0x40738d: Stereo Digital Amp-Out
Amp-Out caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
Amp-Out vals: [0x80 0x80]
Pincap 0x0894: OUT Detect
Pin Default 0x18560010: [Jack] Digital Out at Int HDMI
Conn = Digital, Color = Unknown
Pin-ctls: 0x00:
Connection: 1
0x02
The 'ID 1392' is probably because the HDMI transmitter is a SiI 1392
chip? That chip takes either SPDIF or HDA as an input, so I presume that
the intel G33 chipset is supplying that in some fashion?
Note that the SPDIF from the ALC885 isn't connected to the SiI-1392 (at
least, I presume not as there's a seperate SPDIF output on the board,
and playing sound out the SPDIF line gives nothing on the HDMI output).
# cat /proc/asound/devices
2: : timer
3: : sequencer
4: [ 0- 2]: digital audio capture
5: [ 0- 1]: digital audio playback
6: [ 0- 1]: digital audio capture
7: [ 0- 0]: digital audio playback
8: [ 0- 0]: digital audio capture
9: [ 0] : control
Noting that codec#0 has no input (capture) I'm assuming that codec#0
isn't providing a device that shows up in asound/devices?
So the question is: What is this magic codec#0 device, and how do I get
it working??
Many thanks for any advice,
Michael.
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