I think I've found a solution. In file Mesa-7.3/src/mesa/drivers/dri/r300/radeon_chipset.h, line 190: #define PCI_CHIP_RV515_718A 718A should be: #define PCI_CHIP_RV515_718A 718a I've tested, this fixed the problem and I have direct rendering working. My system is Gentoo 2008.0, with ATI Mobility Radeon X2300. Xorg 7.4, xf86-video-ati open source driver.
The case doesn't matter. I suspect your previous version of mesa was too old and compiling a new one added the necessary pci ids.
Mass version move, cvs -> git
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