Comment 3 for bug 1069498

Problem occurs with Kubuntu 12.04 and got worse with kubuntu 12.10 beta 2.
Default settings (using an usb image to try out Kubuntu 12.10)

Using Intel sandy bridge graphics 2500k processor.
(Problem does not occur on my dell Studio XPS laptop with intel i965 graphics)
When I move a window horizontally the top part is displaced 2-8 mm depending upon the speed of moving.
This problem only occurs with the part of the window that is above a certain height on the screen
Kubuntu 12.04: problem occurs only in top of display (about the height of a window title bar)
Kubuntu 12.10: problem occurs in top 1/6th of the screen.

With Kubuntu 12.10 the problem becomes much more visible.
You notice tearing on a large part of a window that is in thu opper part of the display.

The effect disappears when I turn off vsync in System Settings - Desktop Effects.
(But now the moving is not as smooth on other parts of the screen as with vsync on.)

Reproducible: Always

Steps to Reproduce:
1.start kde
2.drag a window horizontally accross the top part of the screen
3.
Actual Results:
tearing

Expected Results:
smooth