Jeff, how about the current raring kernel? If you're on precise then
just sudo apt-get install linux-generic-lts-raring. Can you please get
the info in comment 10 also so we can see what the actual problem is and
dig into it more?

echo 6 > /sys/modules/drm/parameters/debug ; sleep 20; dmesg

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/964231

Title:
  System Stutter When HDMI Monitor Is Connected

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