I have a Fujitsu 435Dx laptop with the NeoMagic with the 128ZV (NM2093) chipset. XF86_SVGA works fine when only using 8bpp, but when using 15 or 16bpp there are occasions where the display has a few horizontal lines of what looks like random pixels.
We will need to get a laptop or card that has this chipset in it before we will be able to accurately verify that this is indeed a bug.
Red Hat hired an outside contractor to write a Neomagic binary only driver so as to be able to address support concerns for people who could not get Neomagic to work at all with XFree86. The drivers cam without any warranty and a larger portion of people reported success using the driver. After a time Neomagic finally released specifications for the chipset and the binary drivers were rolled over into the standard XFree86 distribution. Since that happened with time they will become more stable and better performance. We as of yet do not have any laptops in our test lab that have the NEomagic chipset in them so therefore to do any testing we will need to get one into the lab. Until then I have marked this bug as later.