Look at the pictures in the following links:
https://en.wikipedia.org/wiki/Screen_tearing
http://withfriendship.com/user/neeraj/s ... earing.php
You can easily test your computer by viewing the following video where it is very obvious if you have a screen tearing problem. If the white bar is moving in one piece without any tearing or any weird artifacts, everything is ok. Otherwise you have a screen tearing problem.
http://www.youtube.com/watch?v=ceX18O9pvLs
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@DeMus
Your solution worked wonderfully for me on LinuxMint 17 64-bit XFCE with a Nvidia GTX 750 graphics card using the 340.32 proprietary Nvidia graphic driver! Thank you ever so much!
Even though during my install of the driver I ok'd it to run nvidia-config and write the xorg.conf file, when I took a look at the file there seemed to be a lot of information missing regarding my monitor. I used the following command in the terminal to look at that file:
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sudo gedit /etc/X11/xorg.conf
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sudo /usr/bin/nvidia-settings
Opened the xorg.conf file again:
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sudo gedit /etc/X11/xorg.conf
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Option "metamodes" "nvidia-auto-select +0+0"
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Option "metamodes" "nvidia-auto-select +0+0 { ForceFullCompositionPipeline = On }"
Now there is no more screen tearing and I am happy!
Edit: As another possible solution, I noticed that the screen tearing went away when disabling "compositing" which is found in: Start menu---> Settings---> Window Manager Tweaks. And then click on the "Compositor" tab and uncheck mark "Enable display compositing". But I did not have enough knowledge to know what I'm losing by disabling that feature. Hence why I chose to try DeMus's solution with compositing enabled as is it's default.