Adam Dingle, thank you for reporting this and helping make Ubuntu
better.

Could you please boot into a working environment of Ubuntu (i.e. without 
disabling the nvidia card), and run the following command once from a terminal 
by ensuring you have the package xdiagnose installed, and that you click the 
Yes button for attaching additional debugging information:
apport-collect -p xorg 1190806

** Package changed: xserver-xorg-video-intel (Ubuntu) => xorg (Ubuntu)

** Changed in: xorg (Ubuntu)
   Importance: Undecided => Low

** Changed in: xorg (Ubuntu)
       Status: Confirmed => Incomplete

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Touch seeded packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1190806

Title:
  X server fails to start on MacBookPro9,1 with hybrid Intel/Nvidia
  graphics: no screens found

Status in xorg package in Ubuntu:
  Incomplete

Bug description:
  I have a MacBookPro9,1, which has both an integrated Intel HD Graphics
  4000 controller and a discrete Nvidia GeForce GT 650M.  I want to
  disable the Nvidia graphics and boot using Intel only, since I don't
  need the Nvidia chip's capabilities and it shortens battery life (and
  makes suspend/resume not work; see bug #1084960).  But when I
  blacklist the Nouveau driver and reboot using the Intel driver only,
  the X server fails to start: it reports "no screens found" and
  crashes.

  I'm booting using EFI rather than BIOS; not sure whether that's
  relevant.

  I'll attach the X server log and the dmesg log.  Just let me know if
  there's any other information I can provide.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1190806/+subscriptions

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