amd64/71753: DRI loads but fails to render on Radeon 9200se(RV280).

[Eric Anholt]

The following reply was made to PR amd64/71753; it has been noted by GNATS.

From: Eric Anholt <anholt at FreeBSD.org>
To: John Baldwin <jhb at FreeBSD.org>
Cc: freebsd-amd64 at FreeBSD.org, Adam Gregoire <bsdunx at yahoo.com>,
	gnats <freebsd-gnats-submit at FreeBSD.ORG>
Subject: Re: amd64/71753: DRI loads but fails to render on Radeon
	9200se(RV280).
Date: Wed, 15 Sep 2004 18:07:52 -0700

 On Wed, 2004-09-15 at 14:24, John Baldwin wrote:
 > Do you have any errors in Xorg.0.log?  Also, did you add an 'AGPSize' option 
 > to your Xorg config file to tell it you have a 64MB aperture?  X seems to 
 > assume a default size of 8MB unless you explicitly tell it you have more.
 
 The AGPSize is just to say how much of the aperture to allocate and bind
 for use.  It turns out that 8MB is all that's really necessary, due to
 poor or nonexistent use of AGP textures, so that basically what gets
 used in AGP are the 3MB of vertex/indirect/ring buffers.
 
 I wasn't previously aware of any 64-bit issues in the Radeon/R200 DRI
 (and some have used these on 64-bit machines before), but to me that
 seems like the most likely reason to find bad command buffers.
 
 -- 
 Eric Anholt                                eta at lclark.edu          
 http://people.freebsd.org/~anholt/         anholt at FreeBSD.org