On a thinkpad L412, running xubuntu 15.04, I get various strange atrifacts on the screen, mostly stripes. It can realiably be triggered by moving the mouse pointer to the upper left corner. It also shows up around icons as single short stripes. Sometimes, the screen flashes wildly. The strange thing is, it seems to depend on the kind of software I use. A xfce terminal seems not to do much trouble, but a webbrowser causes catastrophic effects, after running a few minutes:
I can then switch the virtual desktop with keeboard shortcuts, and the flashing goes away. If I switch back to the browser window, the flashing is back. I can kill the browser, the flashing is gone.
Also, it seems to be triggered by reaching edges of the screen with the mouse, the upper right corner seems most sensitive.
I had similar experience with fedora, so it looks a bit like a hardware issue. Without knowing anything about the working of lcd panels, I would expect a more regular flashing, not to be dependent on the screen area and application in use. So I am not completly convinced - couldn't it also be an issue with the graphics driver?
Any thoughts about this? Anything I could do except get a new computer?