"Rage Mobility" comes in both Rage Pro (IE, Mach64-descended chips) and Rage 128 flavors, but digging through the rest of that doc it lists "PowerBook4,1" as a supported system... which translates to the first-gen Snow iBook G3s, which had Rage 128-based Mobility chips so.... yeah, it's pretty likely it'll work as well on a desktop Rage 128 as it does on the laptop.
It's my vague recollection that the Rage 128 worked "okay" under Linux for 3D back in the day (like, way back in the day, when if you wanted 3D you were left messing around with setting up Mesa on your own) and was somewhat less of a pain in the neck to get working than the Mach64-descended Rage chips were, but it is also true that it has some hardware limitations that prevent it from working with Linux environments that use 3D acceleration for the desktop. (Long and short of it: they worked okay with game software that used OpenGL rendering, but because they only support power-of-2 texture sizes they can't support Compiz or other OpenGL compositing.) Because of that compiz limitation it's possible modern Linux-i don't bother enabling OpenGL acceleration on anything less than a Radeon, I can't say I've looked. It's possible it may only give you framebuffer-level graphics.