Ubuntu: Ubuntu 16.04 Mouse flickering while hovering window border


I am new to Ubuntu and I discovered a problem while using it. When I move my mouse to the top border of a window, example on the web browser, where the tabs are, my mouse instantly starts to flicker.

This makes it hard to close windows because of the mouse lag. Is there any solutions or ideas on this problem? Thank you :)

Graphics info:


   description: VGA compatible controller       product: 2nd Generation Core Processor Family Integrated Graphics   


   vendor: Intel Corporation       physical id: 2       bus info: pci@0000:00:02.0       version: 09       width: 64 bits       clock: 33MHz       capabilities: msi pm vga_controller bus_master cap_list rom       configuration: driver=i915 latency=0       resources: irq:36 memory:dc400000-dc7fffff memory:b0000000-bfffffff ioport:e000(size=64) memory:c0000-dffff  


I found the problem. For some reason I had a dual screen that I noticed when I went to the Workspace Switcher. So I went to System Settings, then to Displays and I turned the other display off which was called Unknown Display. This left me with Built-in Display after I applied the changes by hitting the Apply button.

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