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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1336451/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
