I have filed bug #1631519 [1] and I think it's xorg, but using a ThinkPad x230 with a monitor attached to the mDP port you do not get to X on boot. If the external monitor is attached after booting to X you get window trails.
I have also noted this failure in the QA tracker[2]. I can try to help debug this if you have suggestions. Regards, Robert Jennings [1] https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1631519 [2] http://iso.qa.ubuntu.com/qatracker/milestones/360/builds/132831/testcases/1497/results
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