I'm running a i7 2600k on an Asus P8P67 (standard), running kubuntu with
the latest stock kernel on Natty.

When overclocked, my system fails to resume on suspend, though suspend
seems to succeed. I can stably overclock to 4.8 Ghz and everything but
suspend/resume works without issue.

When not overclocked, my system is able to resume successfully. This is
regardless of the state of the virtualization option in the bios. (FYI
Virtualbox works fine on my system.)

Loading the kernel module xhci_hcd does not fix the resume issue when
overclocked. I have also compiled several custom kernels with various
options, and while they dramatically improve performance, they have not
resolved the suspend issue.

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https://bugs.launchpad.net/bugs/760842

Title:
  Natty Narwhal/Sandy Bridge Suspend Fails

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