I'm running Suse 9.1 (with all the latest updates from Suse)
XFree86 version 4.3.99
on Intel P4 with Radeon 9800 Pro 128 MB
ATI Driver 3.14.1

When there is a window with black background (or black desktop)
I get a lot of thin Technicolor lines that are going from left to right
and appearing at different Y position on the screen.

Any idea how to fix this?

If anyone has the same setup and does not have this problem could you please
send me your XF86Config file.