Xorg doesn't start on Macbook Pro 4,1

Question

I've just installed Arch on my Macbook Pro 4,1 (Early 2008).
The machine has this graphics card:
VGA compatible controller: NVIDIA Corporation G84M [GeForce 8600 GT] (rev a1)
I've installed "nvidia" package driver, launched "nvidia-xconfig" but when I try to launch:
X -config /etc/X11/xorg.conf
Xorg gives me some errors and doesn't starts X.
http://i.imgur.com/AtzHf77l.jpg
Ideas?
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Answer 1

Yeah it is quite a mess... but thats what you get when you try to use hardware that picks and chooses the bits of the UEFI standard it wants to include.
So like most UEFI systems, Mac(book)s are able to boot their own system with it's EFI setup.  It *can* also be used to boot other systems, but setting it up is unique to Macs.  So for the purpose of "bootcamp", Apple introduced a bios compatibility mode.  When it was introduced, there was no real windows UEFI prevalence (existence?) at that point.  So that is how they made this possible.
But the compatibility mode is not turned on by default.  OSX uses GPT (according to the standard and everything in this case), but when it makes a "bootcamp" partition it adds to the GPT a MBR partition table (ms-dos) with partitions.  According to the GPT spec, there is the actual GPT partition table, but there is also the inclusion of a MBR with a single partition spanning the whole disk.  This is to protect the disk from being overwritten by non-GPT aware tools (like fdisk was until recently).  So a hybrid MBR simply adds partitions to the ms-dos partition table that (hoepfully) line up with at lease the first few partitions of the GPT.  When this is present, the machine will enable the bios compatibility mode.
Booting the Mac with EFI will have no bearing on the Arch Linux installation that is installed in bios compatibility mode.  It will use its own bootloader and everything.  So there should be no issue.  It is probably good to use something like rEFInd in order to give yourself a nice interface with which to select between the two though.  The other boot loaders and/or boot managers don't have the ability to recognize both EFI and bios bootloaders.