Problems starting Xorg on Macbook Air 3,2

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https://bbs.archlinux.org – I've tried the solution in here: https://bbs.archlinux.org/viewtopic.php?id=123306 (same problem as here, too)But mesa-git requires LLVM 3.2+ with amd gpu support for some reason (even though I'm on nvidia), and llvm-amdgpu-git has some problem where it can't compile due to a missing header.When I run with nouveau and nouveau-dri installed, I can start X, but I get very strange behaviour - vanilla X with xterm and DWM can both start, but they lock up fairly soon. If I start up via SLiM, the default background has crazy visual artifacts all over the screen. When I type into xterm (HowTos)