From owner-freebsd-multimedia Wed Sep 6 13: 9:19 2000 Delivered-To: freebsd-multimedia@freebsd.org Received: from anchor-post-35.mail.demon.net (anchor-post-35.mail.demon.net [194.217.242.93]) by hub.freebsd.org (Postfix) with ESMTP id B79D137B43F; Wed, 6 Sep 2000 13:09:12 -0700 (PDT) Received: from nlsys.demon.co.uk ([158.152.125.33] helo=herring.nlsystems.com) by anchor-post-35.mail.demon.net with esmtp (Exim 2.12 #1) id 13WlVO-000BKw-0Z; Wed, 6 Sep 2000 21:09:11 +0100 Received: from salmon.nlsystems.com (salmon.nlsystems.com [10.0.0.3]) by herring.nlsystems.com (8.9.3/8.8.8) with ESMTP id VAA04063; Wed, 6 Sep 2000 21:10:15 +0100 (BST) (envelope-from dfr@nlsystems.com) Date: Wed, 6 Sep 2000 21:10:10 +0100 (BST) From: Doug Rabson To: Alfred Perlstein Cc: Stephen Hocking , multimedia@FreeBSD.ORG, dfr@FreeBSD.ORG Subject: Re: Strange problems with AGP driver & sound. In-Reply-To: <20000906110143.G18862@fw.wintelcom.net> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-multimedia@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org On Wed, 6 Sep 2000, Alfred Perlstein wrote: > * Stephen Hocking [000906 10:53] wrote: > > > > With very recent current sources, the agp driver doesn't probe when loaded as > > a module, but works OK when compiled into the kernel. > > > > However, when compiled into the kernel, it seems to mess up the sound driver > > (pcm, crystal cs23x) such that no sound or garbled sound at a low volume comes > > out. Has anyone else seen this? I'm using the mga driver from the XFree86 cvs > > tree to do 3D work, which is why I'm using the AGP driver. > > Sorry to answer a question with a question, but what does the AGP > driver do? There's no manpage and my AGP mga400 'works' but without > acceleration without it loaded. Could not having AGP loaded be > why i'm having problems with acceleration? The AGP driver is required for 3D acceleration. Basically, its a mapping table which translates non-contiguous physical memory into a range of contiguous bus addresses. The 3D drivers use this to help allocate large DMA buffers for streaming 3D commands to the hardware. -- Doug Rabson Mail: dfr@nlsystems.com Nonlinear Systems Ltd. Phone: +44 20 8348 3944 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-multimedia" in the body of the message