From owner-freebsd-current@FreeBSD.ORG Fri Mar 28 17:21:48 2003 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 5346D37B401 for ; Fri, 28 Mar 2003 17:21:48 -0800 (PST) Received: from puma.icir.org (puma.icir.org [192.150.187.73]) by mx1.FreeBSD.org (Postfix) with ESMTP id E5E6343FD7 for ; Fri, 28 Mar 2003 17:21:47 -0800 (PST) (envelope-from hodson@puma.icir.org) Received: from puma.icir.org (localhost [127.0.0.1]) by puma.icir.org (8.12.3/8.12.3) with ESMTP id h2T1LjAT046939; Fri, 28 Mar 2003 17:21:45 -0800 (PST) (envelope-from hodson@puma.icir.org) Message-Id: <200303290121.h2T1LjAT046939@puma.icir.org> X-Mailer: exmh version 2.5 07/13/2001 with nmh-1.0.3 X-Exmh-Isig-CompType: auto X-Exmh-Isig-Folder: inbox From: Orion Hodson To: "Kevin Oberman" In-Reply-To: <20030329002627.CC96369@ptavv.es.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Fri, 28 Mar 2003 17:21:45 -0800 Sender: hodson@icir.org cc: current@freebsd.org cc: Roger Hardiman Subject: Re: AC97 sound problems with current X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 29 Mar 2003 01:21:49 -0000 Kevin Oberman writes: | More information on my AC97 experiences: | | I forced the card to 4.8 KHz which is what it was running at on V4. This | seems to have not helped the performance of GnomeMeeting at all. The | sound I hear is in "spurts" which are at the correct frequency and last | about a tenth of a second. with gaps between them of about 1 second. Is 4.8kHz a typo? It should be 48kHz or 55913Hz depending on your h/w. Which of the two is all the calibration test is supposed to determine. Some ac97 controllers on ich based systems seem to end up using an alternate clock source: XTAL_IN rather than BIT_CLK. The former clocks the AC97 link at around 55913Hz when it should be at 48kHz. It wasn't clear to me until recently that this was what was happening and until some more testing is done I'm not sure if it's a feature of the ich driver ac97 initialization or just the way it is. I'm currently configuring a laptop to be a netboot server and will sneak up on an unsuspecting ich machine in the next couple of days and endeavor to resolve the problem in situ (right now I'm dog tired of exchanging patches for remote h/w, but that's not to say the offers are not appreciated in general). - Orion