<p><br>
On Apr 8, 2013 1:04 PM, "Beartooth" <<a href="mailto:beartooth@comcast.net">beartooth@comcast.net</a>> wrote:<br>
><br>
><br>
> On Fedora 17 and 18 I sometimes get a display like nothing else I<br>
> know. It's made up of short horizontal lines, some in color, arranged<br>
> into long diagonals that cover the screen, with about the angle of a<br>
> backslash. The little lines in each group are parallel, and there's<br>
> always a little space between every group and the next.<br>
><br>
> It comes up suddenly, on a key press or a mouse click.<br>
><br>
> Once it comes up, it owns the machine -- nothing the mouse or<br>
> keyboard can do (that I know of, anyway) has any effect, and I have to<br>
> hit the reset button.<br>
><br>
> I have yet to discover any correlation with any user action :<br>
> afaict, some power of darkness arms the trigger, apparently randomly, and<br>
> the next thing I do brings on the crash.<br>
><br>
> Has anyone else seen this? Diagnosed it? Found any prevention or<br>
> cure??<br>
><br>
> --<br>
> Beartooth Staffwright, Neo-Redneck, Not Quite Clueless Power User<br>
> Remember I have precious (very precious!) little idea where up is.<br>
><br>
><br>
> --</p>
<p>I had this once, or many instances over a certain period of time, and am still using the same graphics card. I don't think ours heat-related; I can't remember what I did to fix it.</p>