Here's a patch that mainly works. I've still seen the odd case of the texture apparently getting uploaded to the backbuffer.
...but *only* if you have a kernel module installed that understands rectangle state. As it is, the code in radeon_state_init.c allows texture rectangle state to be emitted even if the DRM cannot handle the RADEON_PP_TEX_SIZE_? packets. The result is an immediate "drmCommandWrite: -22" for any GL program. :( I copied over the test from radeon_context.c to the two places in radeon_state_init.c that set-up the state atoms, but that's not a very pretty sollution.
I only noticed this because when I try to insmod the new radeon.o, it fails on an undefined symbol "mmu_cr4_features". The wierd part is that /boot/System.map-2.4.21-rc2-ac2 shows it as being in global BSS ("c02ccd0c B mmu_cr4_features"), *but* /proc/ksyms doesn't show it. I don't get it.
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