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0e1f616
(Get the code!)
The kernel in #45:
1) exhibits the window shuffling issue.
2) if I lock the screen, and sit back for a few seconds, the display blanks, and then (almost immediately) unblanks. I would expect it to remain blanked until there was mouse or keyboard activity.
I suspect that the next step is to instrument things to produce an audit trail of what queries are hitting the driver about the display, and what it's saying... It's behaving like it only sees 1 display part of the time, while both are actually present.