Re: Visual artifacts on radeon 9500 dri

On Sat, 15 Mar 2008 11:00:25 -0500
Reid Linnemann <[email protected]> wrote:

> Hi list, this is my first time posting and I'm not subscribed.
> 
> I'm running Xorg 7.3 with dri on FreeBSD 7-STABLE.
> 
> Some time ago I noticed that seemingly random pixels were not being
> rendered in all GL contexts, and simply chalked it up to my card aging.
> But after a while it started to irk me, and then I remembered something
> about my sapphire 9500 - it's got one of the chips with 8 pipelines but
> only 4 enabled, presumably a 9700 that didn't pass QA and was rebadged
> as a 9500. At one time this card was on a Windows box, and I tried
> enabling all 8 pipelines with the softmod, and got the checkerboard
> pattern that indicated this.
> 
> With this in mind, I took 10 dumps of a glxgears window and merged them
> together in a multilayer image in gimp, alternating multiply/divide, and
> overlaid a 16x16 grid. The artifacting lined up perfectly in the
> checkerboard pattern. I'm now pretty convinced that somehow either my
> system's DRM module, DRI, or radeon driver are erroneously enabling all
> 8 pipelines on the card, resulting in mooky-stink rendering. Anyone have
> any thoughts on this?
> 
> I've attached the images with and without the overlaid grid for reference.
> 
> 

>From memory code which detect card model and decide how many
pipe to enable is wrong for many card. We were just optimistic.

Cheers,
Jerome Glisse <[email protected]>

-------------------------------------------------------------------------
This SF.net email is sponsored by: Microsoft
Defy all challenges. Microsoft(R) Visual Studio 2008.
http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
--