Re: [alsa-devel] HDMI with more than 2ch ?

On 2011-01-24 10:16, Xavier Bestel wrote:

Hi,

I'm using HDMI output on an HD 2600, using KMS from kernel 2.6.37: http://www.alsa-project.org/db/?f=b3f67a0890f9878b7b3f345578e24eda0aaa59ac The problem is that only 2ch are supported (not 1, not 3 or more). I tested with speaker-test, it only works with -c 2.

So how can I access the other PCM channels ? There are 8 of them available in the HDMI standard, I thought the card should be able to drive all of them.

According to your HDMI codec it only supports stereo output, not 8-channel PCM. This is a limitation in your hardware, not in the HDMI standard.

That is, if you want more channels, you probably want to ac3-encode the audio data.