Thanks to Taylor (#16), i got my screen tearing-free for fullscreen OpenGL(9800 
GT, Natty):
-enable "unredirect fullscreen" + "vsync"
-set refresh-rate to 60
-uncheck automatic detection of refresh rates (detection fails: ccsm says 50, 
xrandr says 50 too, nvidia-settings 60, OSD of my screen 60 )
The only regression is that this way there is no preview of the fullscreen 
window if I hit Alt-Tab Window switching - Its OK for me.
Nevertheless I hoped with the "X Sync Fences" in X 1.10 everything would work 
out of the box.

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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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