From: Reid L. <lr...@cs...> - 2008-03-17 13:08:27
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Written by Alex Deucher on 03/16/08 19:55>> > On Sun, Mar 16, 2008 at 8:49 PM, Reid Linnemann <lr...@cs...> wrote: >> Jerome Glisse wrote: >> > On Sat, 15 Mar 2008 11:00:25 -0500 >> > Reid Linnemann <lr...@cs...> 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 <gl...@fr...> >> >> 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 FWIW I've tried changing the value of this constant from 3<<1 (or 6) to 2<<1 (or 4), but the bad tiles persist - only unrendered to. They just appear as flickering holes in the gl context in the same checkerboard pattern. Does that mean anything to you? Thanks, Reid |