When my laptop comes out of sleep, there are thick black edges appear behind each window. This happens to all UI elements which cast a shadow, like some dropdowns an textbox suggestions.
These thick black edges do not go away until I restart laptop. I had upgraded from ubuntu 13.10 to 14.04 when this problem started occurring. I have installed all updates, but still this issue persists. Has anyone faced this problem before and found any solution?
My laptop model is HP pavilion dv-7t 3000 and graphics card model is NVidia GeForce GT 230M (N10P-GE).