Are you using the 2.6.0-test? kernel. If you are I have the same problem and I don't think that anyone has fixed it yet. I heard that 2.6.0-test9-mm1 works but mm2 does not. Googling I have found links to patches but have no clue how to use them could someone help us out.
http://www.cliff.biffle.org/cpq2100.php http://www.lstud.ii.uib.no/~s864/kernel/drm-agp-module-dependency-fix2.patch
are the links to the patches.
I also didnt have DRI working with test9-mm2, and reverted back to test9-mm1 for the time being. I see that apparently mm4 is out now, so i suppose i will give it a shot when i have some time.
Also: i dont see what you were pointing to in the first link, but the second appears to be a possible agp fix (that may already exist in mm4)
--
Chris I
For God's sake, stop researching for a while and begin to think!
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