Disabling compositing in xorg.conf seems to stop the tearing (so far,
anyway):
Section "Extensions"
Option "Composite" "Disable"
EndSection
That seems to point to an xorg bug of some sort.
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https://bugs.launchpad.net/bugs/600178
Title:
Screen tearing when dragging window, in videos and other large screen
redraws (on nVidia GPU)
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