xf86-video-intel-2.1.1 require DRM version at least 1.7.0 to use TTM-based memory manager. Kernel has version 1.6.0 instead of 1.9.0 (latest).
You will need to wait for 2.6.24, merge window is closed now.
2.6.25-rc1 --> drm-2.6. Closing the bug.