Another update. The idle=poll option was more of a power hog than I realized. I actually ended up going back to nolapic a few days after I used it. After the electricity ran out much, MUCH faster than it should have.
The most recent thing I looked into is the max cstate options. processor.max_cstate didn't seem to work. Though intel_idle.max_cstate does work. I am able to use up to intel_idle.max_cstate=2. This is what I now have as my default boot option. Power usage seems to be acceptable and I am able to see all my cores. When I try intel_idle.max_cstate=3 it fails in the same way as when there are no boot options. So cstate 3 seems to be where the issue lies, as far as I can tell. I do not know how to debug this problem though. Is anyone still watching this bug report? -- 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
