Start X with the nv driver with NoAccel enabled. Start an xterm and kwin configured to use kompmgr. Move the xterm so it's not at (0,0), minimize it, and then hit alt-tab to restore it. The window icon, minimize, maximize, and close buttons are drawn in the wrong place.
Created attachment 11144 [details]
Did this already happen before fb used pixman?
Author: Aaron Plattner <firstname.lastname@example.org>
Date: Thu Aug 16 14:57:18 2007 -0700
Bug #12015: Use the right offsets in the dst arguments of pixman_blt.
:100644 100644 3ad01bf... 68f403f... M fb/fbcopy.c