Re: Visual artifacts on radeon 9500 dri

On Sun, Mar 16, 2008 at 8:49 PM, Reid Linnemann <[email protected]> wrote:
> Jerome Glisse wrote:
>  > 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]>
>
>  I'd be fine if I knew what code initialized the pipelines, then I might
>  be able to alter it to my needs.
>

search for R300_GB_TILE_PIPE_COUNT in r300_state.c

Alex

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