I'm not the author of the patch, CCing alsa-devel and the original author.

On Tuesday 02 of June 2009 23:58:26 Alan Alan wrote:

Hi Marek !

I just read your emailing with nvidia devs about alsa supporting 8 channel lpcm over hdmi.

I checked it out an i have to tell it is working awsome, except for a few bugs:

The channels are wrong mapped. Running a speakertest -Dhdmi -c6 gives the following result (first where it should sound) FL - FL C - RL FR - FR RR - LFE RL - C

The other thing i realized that playback is limited to 16 bits 48 khz. I think the minimum which is supported by nvidia hardware is 24bits 96 (or 192) khz. Why not ?

Could you contact the devs as i don't know how to reach them.

ps.: Mybe my build methot was not 100% ok ? I used 1.020 Alsa with the oatched nvidia.c file. Anyway the amplifier shows multichannel LPCM and that's great news.