Re: Visual artifacts on radeon 9500 dri

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.

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