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[Callan <CGar@xxxxxxxxxxxxx>]

Been experimenting some more. I saw the post at:
http://ubuntuforums.org/showthread.php?t=1084622

The op there also was complaining about not booting without nolapic. But
that with nolacpic only 1 core works.

They linked to:
http://ubuntuforums.org/showthread.php?p=4890758
where they saw these boot options that worked for that user but not for them:
noapic nolapic pci=assign-busses apicmaintimer idle=poll reboot=cold,hard

However they were able to have some success by removing nolapic and just having it as:
noapic pci=assign-busses apicmaintimer idle=poll reboot=cold,hard

Those boot options worked for me too! But I continued experimenting. I
managed to remove everything except for idle=poll.

I understand though that this is a real power hog. But my laptop is
always plugged in so that’s not "too" bad. I will continue testing it to
see if there are any other issues with this option. If not I will
probably change my default boot options from nolapic to idle=poll.

I'll edit the title to reflect this new working boot option.

** Summary changed:

- Cannot boot/run ubuntu without acpi=off or nolapic. Freezes otherwise.
+ Cannot boot/run ubuntu without "acpi=off" or "nolapic" or "idle=poll". Freezes otherwise.

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1336451

Title:
  Cannot boot/run ubuntu without "acpi=off" or "nolapic" or "idle=poll".
  Freezes otherwise.

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  My laptop is a Clevo P570WM with Intel i7-3970X CPU and 2x AMD Radeon HD 7970M GPU's.
  The distro used is Kubuntu 14.04 x64.

  Without adding acpi=off or nolapic to the boot flags my laptop freezes
  a few moments after getting to the login screen. I have tried various
  kernels but the issue persists on all of them. The issue affects the
  live CD, the minimal CD and Kubuntu when its installed.

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