In my newly purchased [Lenovo X1 Carbon] i run into screen tearing issues during web or local video playback with classic windows theme turned on.
I messed around with different video driver settings, under the hood browser parameters, fine-tuning other various tweaks without any changes for good.
To my surprise solution was pretty straightforward.
Aero interface is rendered by Desktop Windows Manager [DWM].
The main thing to understand is that DWM will draw all of the windows using a copy of the last image that was swapped from back to front.
In other words it draws using a copy of the last fully-swapped front buffer image for each window it never displays partially drawn frames.
DWM composites everything with V-SYNC enabled.
So, in a nutshell:
Desktop Window Manager adds an additional layer of protection against tearing and will allow any application running on the system to draw at a rate irrespective of the display’s refresh rate and still prevent tearing.