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bbfa235
(Get the code!)
I have the same motherboard as the OP and an Nvidia graphics card with the proprietary driver.
I didn't experience the problem after upgrading Kubuntu from 13.04 to 13.10 with 3.11.0-12. After upgrading to 3.11.0-13 a few days ago, though, I have had the problem intermittently. Testing my system a few times with 3.11.0-13, it was fine, but I've had the problem twice with the system slept overnight. I'm currently back on 3.11.0-12 without a problem.
In my case, the system wakes up and I can enter a few characters of my password into LightDM. Then the system freezes. It's unresponsive to the keyboard and mouse, and pinging it from another machine fails.