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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/964231 Title: System Stutter When HDMI Monitor Is Connected To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/964231/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs