Hi, This blog post:
http://airlied.livejournal.com/67628.html describes that the arbiter code is there for some particular cases that'll be enabled as more testing is available. Getting the source from xorg-server-1.7.4 and modifying hw/xfree86/dri/dri.c hw/xfree86/dri2/dri2.c to comment out the arbiter check produces a xserver-xorg-core that get DRI enabled without switching to KMS. I also tried the radeon driver in experimental with KMS but segfault on start. My second graphics card is on-board and it is disabled, so I don't expect it to interfere. Hope this helps (and thanks for keeping the bug open, it was great info!) Pablo
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