From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Henningsson Subject: Re: HDMI with more than 2ch ? Date: Tue, 25 Jan 2011 02:17:50 +0100 Message-ID: <4D3E24BE.8030607@canonical.com> References: <1295860599.14528.8.camel@skunk> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from adelie.canonical.com (adelie.canonical.com [91.189.90.139]) by alsa0.perex.cz (Postfix) with ESMTP id A57D8103848 for ; Tue, 25 Jan 2011 02:17:47 +0100 (CET) Received: from hutte.canonical.com ([91.189.90.181]) by adelie.canonical.com with esmtp (Exim 4.71 #1 (Debian)) id 1PhXXW-0000xl-9M for ; Tue, 25 Jan 2011 01:17:46 +0000 Received: from c-83-233-18-148.cust.bredband2.com ([83.233.18.148] helo=[192.168.8.102]) by hutte.canonical.com with esmtpsa (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1PhXXW-0007G8-3T for alsa-devel@alsa-project.org; Tue, 25 Jan 2011 01:17:46 +0000 In-Reply-To: <1295860599.14528.8.camel@skunk> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: alsa-devel-bounces@alsa-project.org Errors-To: alsa-devel-bounces@alsa-project.org To: alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org 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. -- David Henningsson, Canonical Ltd. http://launchpad.net/~diwic