ATI Radeon 9500 to 9800 series receives another fix in Mesa 26.1

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Mesa 26.1 brings another fix for ATI R300 to R500 graphics cards

Open-source ATI R300 driver gets occlusion query fix in 2026.



Mesa’s legacy ATI r300 driver has received another update in 2026. Phoronix reports that independent developer Pavel Ondračkar fixed occlusion query support for the old driver stack used by ATI R300 through R500 class GPUs, and the change has already landed in Mesa 26.1-devel for the next quarterly release. 

Phoronix quotes Ondračkar saying:
 

“This is my attempt to fix the occlusion queries. There was a previous one by @mareko in 2012 which was however later reverted since it broke HyperZ. This approach should hopefully be much less invasive (the dummy z buffer is used only when there is active query), and the tests seem happy. I’ve done also some usual app testing: Unigine, Lightsmark, some wined3d and all seems fine, but more real-world testing would be appreciated OFC.”

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