This is using branch 'radeon-rewrite', last commit I tried was 13e0ff0df1bb75993bded7b248dd37f58fbfd22c, and coupled with Jerome Glisse's git://anongit.freedesktop.org/~glisse/xf86-video-ati branch 'radeon-gem-cs3', otherwist xorg wouldn't start, neither with dri1 or dri2. When using DRI2/KMS, I get the following messages on kdm.log and an unbearably slow X: naming 872 with 44 naming attemp 872 naming 870 with 43 naming attemp 870 naming 6021 with 42 naming attemp 6021 naming 828 with 41 ... a few commits before X was not that slow, there were some lockups but it was usable. On the other hand, when using DRI1, without KMS, I get the these errors: CS section size missmatch start at (r300_cmdbuf.c,emit_tex_offsets,182) 4 vs 2 CS section end at (r300_cmdbuf.c,emit_tex_offsets,202) These have been there for as long as I have tried readeon-rewrite. On both settings, the system is so unusable that I couldn't even file this bug report until I got back to a stable system (mesa-7.5_rc1 and xf86-video-ati from master head minus a few commits right now). There is another issue with Jerome's ati driver which I'll file later, regarding texture video. Thanks for your work ;)
Can you try using linux 2.6.31 and mesa 7.6 or later?
Is this still a problem with current master kernel, libdrm, and xf86-video-ati?
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