After upgrade to Ubuntu 14.04 my mouse pointer is blinking and some time it's disappear, I don't know why this happening
I search lots of for this issue and I get some results but unable to get solutions.
This is my display in Settings -> Display
In your first screen shot, where you have a pink/red rectangle and a green one, this screen indicates two monitors, being one for each color. It's like your ubuntu is seeing two monitors. This second one, indicated by the green square, is what some people told you here as being the Unknown Display.
You should click this green square in order to see the configurations for this display. When you do so, your "Built-in display" button will be now named "Unknown Display" and you should set this to off.
Setting it to off will turn the green screen to gray.
I also had the same problem together with two duplicate screens showing inside a particular workspace while switching them. After I disabled the
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