If you see a shift or a break in these vertical black and white stripes that forms a horizontal line across the screen, that means you have screen tearing. The visual artifact that looks like the edges of the stripes fail to line up occurs when a video or a 3d game is not in sync with the display's refresh rate.
Screen Tearing Example:
• Screen Tearing Example
How to fix Nvidia horizontal lines tearing bug:
• How to Fix Nvidia Graphics Horizontal...
How to fix screen tearing on Intel cards:
• How to Fix Intel Graphics Horizontal ...
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