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[Benjamin Peterson <benjamin@xxxxxxxxxx>]

Seems to work now.

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https://bugs.launchpad.net/bugs/1001091

Title:
  "EFI Boot" from livecd fails on Macbook Pro

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  I performed the following actions on my Macbook pro:
  1. Started it with the alt-option key down to bring up the boot menu.
  2. Inserted the Ubuntu 12.04 Desktop CD.
  3. Selected the "EFI Boot" drive and it enter.
  4. GRUB was loaded, and I hit enter to select "Try Ubuntu w/o installing it".

  At this point the screen goes black and it seems the machine must be shut off with the power button.
  --- 
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  ubuntu     3533 F.... pulseaudio
   /dev/snd/controlC0:  ubuntu     3533 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xb0900000 irq 48'
     Mixer name	: 'Cirrus Logic CS4206'
     Components	: 'HDA:10134206,106b1d00,00100302'
     Controls      : 24
     Simple ctrls  : 10
  Card1.Amixer.info:
   Card hw:1 'Generic'/'HD-Audio Generic at 0xb0840000 irq 49'
     Mixer name	: 'ATI R6xx HDMI'
     Components	: 'HDA:1002aa01,00aa0100,00100200'
     Controls      : 6
     Simple ctrls  : 1
  Card1.Amixer.values:
   Simple mixer control 'IEC958',0
     Capabilities: pswitch pswitch-joined penum
     Playback channels: Mono
     Mono: Playback [on]
  CasperVersion: 1.315
  DistroRelease: Ubuntu 12.04
  LiveMediaBuild: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  MachineType: Apple Inc. MacBookPro8,2
  Package: linux (not installed)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
  ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-23-generic N/A
   linux-backports-modules-3.2.0-23-generic  N/A
   linux-firmware                            1.79
  SourcePackage: linux
  StagingDrivers: mei
  Tags:  precise staging precise staging
  Uname: Linux 3.2.0-23-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 01/24/12
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBP81.88Z.0047.B27.1201241646
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-94245A3940C91C80
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookPro8,2
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-94245A3940C91C80
  dmi.modalias: dmi:bvnAppleInc.:bvrMBP81.88Z.0047.B27.1201241646:bd01/24/12:svnAppleInc.:pnMacBookPro8,2:pvr1.0:rvnAppleInc.:rnMac-94245A3940C91C80:rvrMacBookPro8,2:cvnAppleInc.:ct10:cvrMac-94245A3940C91C80:
  dmi.product.name: MacBookPro8,2
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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