Random patches of black and green striping keep appearing

[Tony Green]

This is an issue with Kubuntu AMD-64-bit, 8.10, with the new KDE4.2 installed. I'm not sure if it's a KDE problem or a xorg problem though.

Since installing KDE4.2, I get frequent patches of black and green stripes appearing in various parts of my screen. It seems particularly common on Firefox, but also happens frequently in other windows. The one I managed to catch a screen-shot of (attached) hit Audacity.

This MAY be partially related to the problem discussed on the KDE forum thread at http://forum.kde.org/annoying-kde-glitch-t-6511.html - however I applied the patch mentioned in this thread some time ago, so it's evidently not the same problem.

There is no obvious pattern to the appearance of this phenomenon; it seems generally random, though it DOES seem to particularly affect parts of the screen where things are changing (for example it actually happened on part of this line I'm typing for a short time just now). It normally goes away when that part of the screen changes; for example, if I get a big block of it on Firefox's window, scrolling it down then up clears it.

As far as I can see, it only happens when compositing is turned on. It makes no difference whether I'm using kwin or Compiz for this; the same problem occurs with both.

[Bryce Harrington (bryce)]

Not enough information to troubleshoot. See http://wiki.ubuntu.com/X/Reporting for instructions on reporting X issues.