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[Albert <sapristi@xxxxxxxxx>]

Tested with 4.6.0-rc6-wily, same result.

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https://bugs.launchpad.net/bugs/1578621

Title:
  Ubuntu 16.04 with kernel 4.4.0-21 freezes at the password prompt upon
  boot unless acpi=off

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  In this macbook pro 11,1, the kernel 4.4.0-21 was able to boot just
  fine.

  But, it would took about 30 seconds before the boot sequence would
  start, because the GRUB partition was not "blessed" (a particularity
  of UEFI systems in apple hardware).

  So I rebooted, held down command+alt+R, which boots from "internet recovery mode" into MacOSX (I don't have otherwise MacOSX installed), from the apple menu I opened a terminal and:
  1. Listed the partitions with "diskutil list" to find out which partition has GRUB.
  2. Run the blessing command: "bless --device /dev/disk1s1 --setBoot --legacy --verbose".

  (While there, I took the opportunity to silence the startup chime
  sound with "nvram SystemAudioVolume=%00".)

  Upon reboot, there is no more delay (hurray!) but now the 4.4.0-21
  kernel would lead to a freeze upon reaching the desktop password
  prompt. The keyboard and mouse were unresponsive.

  To address this, I forced shutdown by holding down the power key for 5
  seconds, then rebooted holding down the "ESC" key to enter the GRUB
  menu, and added "acpi=off" to the kernel parameters.

  The result: booted just fine.

  The freeze is reproducible. Happened a number of times until I
  understood that acpi was the issue.

  Running without a battery charge indicator or a broken wifi is not
  ideal. Is there any workaround to this issue?

  
  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-21-generic 4.4.0-21.37
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  albert     1864 F.... pulseaudio
   /dev/snd/controlC0:  albert     1864 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Thu May  5 08:42:53 2016
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-09-16 (597 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: Apple Inc. MacBookPro11,1
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-21-generic root=UUID=1fe82ec9-9c83-4e33-9506-2f7afb8d9d64 ro libata.force=noncq acpi=off quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-21-generic N/A
   linux-backports-modules-4.4.0-21-generic  N/A
   linux-firmware                            1.157
  SourcePackage: linux
  UpgradeStatus: Upgraded to xenial on 2016-04-23 (12 days ago)
  dmi.bios.date: 02/12/2014
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBP111.88Z.0138.B07.1402121134
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-189A3D4F975D5FFC
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookPro11,1
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-189A3D4F975D5FFC
  dmi.modalias: dmi:bvnAppleInc.:bvrMBP111.88Z.0138.B07.1402121134:bd02/12/2014:svnAppleInc.:pnMacBookPro11,1:pvr1.0:rvnAppleInc.:rnMac-189A3D4F975D5FFC:rvrMacBookPro11,1:cvnAppleInc.:ct10:cvrMac-189A3D4F975D5FFC:
  dmi.product.name: MacBookPro11,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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