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[tedaste <toivo@xxxxxxxxxxxx>]

I tried the daily-live, still the same problem

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https://bugs.launchpad.net/bugs/1525615

Title:
  Ubuntu not booting on iMac 5K with ACPI enabled

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  With a 27in 5k ( new as of two weeks ago) I'm unable to boot the
  kernel without  parameter "acpi=off:", it also needs "nomodeset" into
  order to get a working system.

  The applies to both the live installer and a system installed on disk.
  With out the parameters I just get a blank screen. It gives a blank
  screen event if the "quiet" is removed from the kernel parameters.

  The system has a 250G SSD.

  I'm using the Kubutu live installer for Wily off a USB stick.
  --- 
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CurrentDesktop: KDE
  DistroRelease: Ubuntu 15.10
  InstallationDate: Installed on 2015-12-08 (9 days ago)
  InstallationMedia: Kubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  Package: linux (not installed)
  Tags:  wily
  Uname: Linux 4.4.0-040400rc5-generic x86_64
  UnreportableReason: The running kernel is not an Ubuntu kernel
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True

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