From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugtrack@alsa-project.org Subject: [ALSA - driver 0001914]: playing 2-channel sound on surround device uses rear speakers Date: Wed, 15 Mar 2006 11:59:19 +0100 Message-ID: <36ecb998e0804cde01a6be4e90ecbf24@bugtrack.alsa-project.org> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Return-path: Received: from bugtrack.alsa-project.org (gate.perex.cz [85.132.177.35]) by alsa.jcu.cz (ALSA's E-mail Delivery System) with ESMTP id C2A521F8 for ; Wed, 15 Mar 2006 11:59:19 +0100 (MET) Sender: alsa-devel-admin@lists.sourceforge.net Errors-To: alsa-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org A NOTE has been added to this issue. ====================================================================== ====================================================================== Reported By: mru Assigned To: tiwai ====================================================================== Project: ALSA - driver Issue ID: 1914 Category: PCI - cmipci Reproducibility: always Severity: minor Priority: normal Status: assigned Distribution: Gentoo Kernel Version: 2.6.15-gentoo-r1 ====================================================================== Date Submitted: 03-11-2006 21:25 CET Last Modified: 03-15-2006 11:59 CET ====================================================================== Summary: playing 2-channel sound on surround device uses rear speakers Description: If I play regular 2-channel stereo sound specifying device "surround51" or "surround40" (or either of those with a "plug:" prefix) the sound is output on the rear speakers. 6-channel playback is correct. ====================================================================== ---------------------------------------------------------------------- mru - 03-14-06 23:53 ---------------------------------------------------------------------- Yes, 6-channel playback is fine, as is 2-channel on the "default" device. I installed alsa-lib 1.0.11-rc3; no change. ---------------------------------------------------------------------- tiwai - 03-15-06 11:59 ---------------------------------------------------------------------- I understand slowly what's going on there. The 4.0/5.1 surround outputs use the second DAC. The behavior of this DAC is somewhat strange. If only 2-channel is used, it's routed to rear. If 4 or more channels are used, it works as 4.0/5.1. And, in surround40 and surround51 definitions, there is no restriction of channels. That is, if the PCM is opened with 2 channels, it is regarded as the rear output. Maybe we need a route plugin wrapping surround40/51 to fix the channel numbers... Issue History Date Modified Username Field Change ====================================================================== 03-11-06 21:25 mru New Issue 03-11-06 21:25 mru Distribution => Gentoo 03-11-06 21:25 mru Kernel Version => 2.6.15-gentoo-r1 03-14-06 15:04 tiwai Note Added: 0008477 03-14-06 15:15 mru Note Added: 0008478 03-14-06 15:22 tiwai Note Added: 0008481 03-14-06 23:53 mru Note Added: 0008524 03-15-06 11:59 tiwai Note Added: 0008536 ====================================================================== ------------------------------------------------------- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&dat=121642