I also noticed that problem. Most times when I start my mythbuntu
machine I have no 3D accelaration:

(WW) RADEON(0): [agp] AGP not available
(EE) RADEON(0): [agp] AGP failed to initialize. Disabling the DRI.
(WW) RADEON(0): Direct rendering disabled

And yes, it is caused by drm and radeon drivers loaded before agpgart
module.

Sometimes it is possible to stop gdm service, then unload radeon, drm
and ttm kernel modules, load them again and get 3D acceleration working.
But sometimes I get only black screen and top shows that Xorg is eating
almost 100% of my cpu.

Problem seems to be similar to describe in bug
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/430694

My machine is an AMD Sempron 2400+ / VIA KT600 based desktop pc with
Radeon 8500DV (R200) graphics.

-- 
Radeon module loaded before agpgart
https://bugs.launchpad.net/bugs/468413
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