Anything surrounding a window (that is, the title bar and the buttons on it, the window borders, and the window shadows) is rendered incorrectly. This includes shadows that surround menus. The best way to describe this is with a screen shot. Reproducible with all decoration styles. Not reproducible with desktop effects off. Windows still function normally and close, minimize, maximize, and open the window menu when the appropriate place is clicked.
Steps to Reproduce:
1. Turn on Desktop Effects.
2. Open a window.
Window decorations, borders, and shadows are rendered incorrectly.
Expected window decorations, borders, and shadows to appear normal.
Nvidia GeForce FX 5200, driver version 173-updates. Occurs with other driver versions as well. Started occurring after upgrade to Kubuntu 11.10.
Screenshot, with window decoration, window shadow, and menu shadow behavior:
is bug #282882 & bug #293325 - picking random dupe
can partially be worked around by "kwin --replace --graphicssystem native &" but you want 4.8.1 or up.
*** This bug has been marked as a duplicate of bug 282882 ***