From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Alexander E. Patrakov" Subject: Re: Radeon unconnected HDMI eats samples at 280 kHz Date: Sat, 20 Sep 2014 00:19:52 +0600 Message-ID: <541C73C8.3040606@gmail.com> References: <54198F38.30002@canonical.com> <5419FC9E.9010302@iki.fi> <541A5BCD.2040105@canonical.com> <541A8FA2.7090406@canonical.com> <541C31EE.4020101@canonical.com> <541C6C23.1040403@canonical.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: Received: from mail-la0-f51.google.com (mail-la0-f51.google.com [209.85.215.51]) by alsa0.perex.cz (Postfix) with ESMTP id D19E32650FA for ; Fri, 19 Sep 2014 20:19:55 +0200 (CEST) Received: by mail-la0-f51.google.com with SMTP id gi9so3650949lab.10 for ; Fri, 19 Sep 2014 11:19:55 -0700 (PDT) In-Reply-To: <541C6C23.1040403@canonical.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: alsa-devel-bounces@alsa-project.org To: David Henningsson , "Deucher, Alexander" , Takashi Iwai Cc: Anssi Hannula , "alsa-devel@alsa-project.org" List-Id: alsa-devel@alsa-project.org 19.09.2014 23:47, David Henningsson wrote: > If audio_enabled quickly changes to off and then on when there is a mode > change, it might make sense to *not* wake up the audio driver in this > case, as I assume that the audio capabilities on the HDMI TV will not > change just because the video mode changes. Unfortunately, they will. Some low-resolution video modes just don't have enough pixel clock to transfer the 7.1 audio signal at 192 kHz. See the table on page 105 (shown as 121 in some readers) of http://www.microprocessor.org/HDMISpecification13a.pdf , section "7.3.3 Video Dependency". -- Alexander E. Patrakov