Version: (using KDE 4.2.4) OS: FreeBSD Installed from: FreeBSD Ports I use current kde4 on FreeBSD 7.2-PRERELEASE with NVidia 9400GT card, nvidia driver and with compositing type=OpenGL. Sometimes after window is maximized or resized it becomes black. Changing composite type to XRender and back fixes the problem for a while. And then it happens again. Yuri
sounds very much like a driver bug :-( When window sice changes a new pixmap needs to be bound and when the window becomes black it looks like the pixmap could not be bound. What driver version are you using? Is there perhaps a newer one for freebsd?
I am using nvidia-driver-180.60. Based on this website: http://www.nvidia.com/object/unix.html this is the latest version.
you could /try/ the beta driver from here http://www.nvidia.com/object/linux_display_ia32_185.18.14.html also, do you have the blur effect enabled and maybe "few" VRAM (compared to your resolution)?
marking as duplicate as same driver version and same problem. *** This bug has been marked as a duplicate of bug 198410 ***