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[Jeff Lane <jeffrey.lane@xxxxxxxxxxxxx>]

added ubuntu-lts-vivid as it gives me the same result.  Freezes after
loading the kernel and initrd (and booting into SMP). I have to boot
with nosmp in order to get a running system.

Booting without "nosmp" freezes to the point that a hard reset is
necessary.

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https://bugs.launchpad.net/bugs/1487621

Title:
  Fails to boot on Macbook Air 2013 (Haswell)

Status in linux-lts-utopic package in Ubuntu:
  New
Status in linux-lts-vivid package in Ubuntu:
  New

Bug description:
  I keep running into issues with booting on a 2013 Macbook Air.  After
  grub, the kernel and initrd load and the system then just hangs with a
  blinking cursor.

  Removing the "quiet" and "splash" options shows me that the kernel
  hangs bringing up SMP, just as in bug #1197451 which has been marked
  Fix Released already (some time ago, actually).

  I get exactly what was mentioned in the comments about SMP hanging and
  have had to manually inject nosmp into the boot command when I boot
  the machine.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.16.0-40-generic 3.16.0-40.54~14.04.1
  ProcVersionSignature: Ubuntu 3.16.0-40.54~14.04.1-generic 3.16.7-ckt11
  Uname: Linux 3.16.0-40-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.14.1-0ubuntu3.12
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Fri Aug 21 17:17:40 2015
  InstallationDate: Installed on 2015-06-11 (71 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64+mac (20150218.1)
  SourcePackage: linux-lts-utopic
  UpgradeStatus: No upgrade log present (probably fresh install)

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