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[Bug 1525615] Re: Ubuntu not booting on iMac 5K with ACPI enabled


I'm running into the same issue. Tried Kernel 4.4-rc5, would also not
boot without acpi=off and nomodeset.

After booting with those two parameters, the GUI is very sluggish,
animations take on the order of seconds.

Also lost mouse and keyboard (wireless) functionality when upgrading  -
possibly unrelated.

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  Ubuntu not booting on iMac 5K with ACPI enabled

Status in linux package in Ubuntu:

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.

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