Date: Wed, 6 Sep 2000 21:10:10 +0100 (BST) From: Doug Rabson <dfr@nlsystems.com> To: Alfred Perlstein <bright@wintelcom.net> Cc: Stephen Hocking <shocking@houston.rr.com>, multimedia@FreeBSD.ORG, dfr@FreeBSD.ORG Subject: Re: Strange problems with AGP driver & sound. Message-ID: <Pine.BSF.4.21.0009062108330.530-100000@salmon.nlsystems.com> In-Reply-To: <20000906110143.G18862@fw.wintelcom.net>
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On Wed, 6 Sep 2000, Alfred Perlstein wrote: > * Stephen Hocking <shocking@houston.rr.com> [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
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