I can reproduce it here with kubuntu edgy eft and Option "XaaNoSolidTwoPointLine" indeed does fix the issue
01:00.0 VGA compatible controller: nVidia Corporation GeForce Go 6200 TurboCache (rev a1) -- xorg nv driver needs XaaNoSolidTwoPointLine https://launchpad.net/bugs/94708 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
