[alsa-devel] Enabling HDMI HBR mode on Intel HDA

Anssi Hannula anssi.hannula at iki.fi
Fri Jul 30 17:35:19 CEST 2010

Anssi Hannula kirjoitti perjantai, 30. heinäkuuta 2010 15:48:41:
> We have been trying to get truehd/mlp/mat passthrough to work, with no luck
> so far. As HDMI standard requires a separate transmission mode (i.e. HBR
> Audio Stream Packets instead of Audio Sample Packets) for high-bitrate
> (over 6.144Mbps) compressed formats, a driver change is needed, AFAIU.
> Attached is a hack we have been using with hda_intel driver (the patch is
> for generic code; we have been using nvidia 8x codec if that matters).
> Could anyone familiar with Intel HDA confirm whether the hack looks
> correct, or if something more is required? (0x05 is the hardcoded pin
> nid).

Naturally I figured it out just few hours after sending the message... I had 
to set bit 15 (stream-type) in format to 1.

I'll now look into properly integrating this support to alsa.

Anssi Hannula

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