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1b1ed1a
(Get the code!)
Just a note to say that this issue is still present in kernel 2.6.20 in Gentoo.
I'm a Gentoo user, but I opened the bug in Ubuntu's launchpad, https:/
On Gentoo, I initially did not have the problem of agpgart misidentifying the agp aperture as 4M instead of 128M (set in BIOS) and the consequence that the radeon driver reports that agp could not bind so no DRI.
I believe things changed when the device ids for SIS 760 were added to the vanilla kernel and then the Gentoo sources from the Ubuntu kernel where they were first. When my SIS chipset was identified generically, it would be recognized by agpgart during boot as having a 128M aperture, which is correct. AND DRI worked. When the chip is identified as SIS 760, the result is incorrect - 4M aperture.
In order to test this theory, I attempted to patch my current kernel ( 2.6.20-gentoo-r8) by commenting out the lines added to amd64-agp.c that mention SIS 760, in the hope that it would then fall back to the generic detection. But unfortunately this did not work. So I don't know. It's quite possible that I did something wrong.
Anyway, I'm just hoping to draw some attention to this still-unresolved issue in the hopes of being able to use the DRI capabilities of my radeon 9250 card once again. Thanks.