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

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Tyberius Prime <1525615@xxxxxxxxxxxxxxxxxx>
Date: Wed, 16 Dec 2015 10:06:04 -0000
Reply-to: Bug 1525615 <1525615@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

acpi = ht does not work. 14.04 and 13.04 won't boot without acpi=off
either.

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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.

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