kernel-packages team mailing list archive

["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

tedaste, using the default Ubuntu kernel (not 3rd party), could you please utilize your WORKAROUNDs, boot into a working system, and then execute the following via a terminal as it will attach necessary debugging information:
apport-collect 1525615

** Tags added: xenial

** Description changed:

- 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.
+ With a 27in 5k ( new as of two weeks ago) I'm unable to boot. The
+ applies to both the live installer and a system installed on disk. 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.
  
- 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.
+ WORKAROUND: Use kernel parameters:
+ acpi=off nomodeset
  
- 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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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
  applies to both the live installer and a system installed on disk. 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.

  WORKAROUND: Use kernel parameters:
  acpi=off nomodeset

  ---
  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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