kernel-packages team mailing list archive

[Callan <CGar@xxxxxxxxxxxxx>]

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?

-- 
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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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