I have Lubuntu 16.04. It is running on a Thinkpad X201 using Intel graphics devices (no Nvidia here).
After I watch a video on Youtube or use mplayer
to watch a video, the screen flickers black right up to where my mouse cursor is.
It looks like this.
Logging out and logging back in resolves the issue.
Update: This only occurs when the mouse cursor is more than about an inch from the right hand side of the screen.
Any thoughts on how I can fix this?