[SlimDevices: Unix] pCP7 and HDMI Audio

[paul-]

Lets move this over here.

RPi has made a lot of changes in HDMI Audio.  Its really hard to
trackdown without hardware to play with.   Note the kms driver will only
currently work on the 32bit kernels.

There are two modes now
*Audio Provided by Firmware:* This will show as CARD=b1 in alsa
config.txt cont

Code:
--------------------
    
  dtparam=audio=on
  audio_pwm_mode=2
  hdmi_drive=2
  hdmi_force_hotplug=1
  hdmi_force_edid_audio=1
  
--------------------


*Audio Provided by kms driver:* This will show as CARD=vc4hdmi in alsa
This requires you to load the graphics kernel modules.  There is some
commentary that edid information must be correct with the kms driver.

Code:
--------------------
    
  pcp-load -wi graphics-KERNEL.tcz
  
--------------------

Then your config.txt would look like

Code:
--------------------
    
  dtparam=audio=off
  dtoverlay=vc4-kms-v3d   (or vc4-kms-v3d-pi4 if you have a pi4)
  hdmi_drive=2
  hdmi_force_hotplug=1
  hdmi_force_edid_audio=1
  
--------------------



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