Hi. I'm running Xubuntu 11.10. I have had something strange going on for a while now where sometimes, when I turn on the computer, a few pixels will be missing from the top of the screen, and two of them will flash white about twice per second. Also, when this occurs, sometimes a large, jagged chunk will be taken out of the picture on the top of the monitor, and it will just be black there. When I move the mouse, that goes away. Here's a picture. It looks kind of foggy on the preview page but you can see it better if you zoom.
I tried another monitor and it's the same. The reason I don't think this is a cable issue or some other hardware problem is that whenever this happens, as soon as I start typing something, (usually when I press enter), I will get spontaneously logged out of my desktop session and have to log in again. Then, when I am back, the blinking and other weirdness will be gone.
Any ideas on what this might be?