There is a black pattern of dots and lines blinking randomly on my screen. It appears randomly, sometimes every 30 seconds, sometimes it doesn't occur at all for a week or so. I had this issue for several months now, both in 13.04 and 13.10. 

It looks more or less like the screenshot this gentleman has taken, although the pattern is different:

[Random black dot on the screen](https://askubuntu.com/questions/313190/random-black-dot-on-the-screen)

It seems to be linked to mouse pointer movement. In rare cases, the pattern stays on the screen if I happen to stop moving the mouse or scrolling at the right moment. As soon as I move the mouse or scroll, the pattern vanishes.

I managed to take some screenshots, but I'm not sure how to upload them here.

I run 13.10 (64) on an Intel IvyBridge Mobile.

EDIT: New drivers seem to have done the trick.

EDIT: The problem persists. Back to square one.