" Guys, i love my flashing white cursor and i want it back!"
I'm sorry, I've no experience with any riva framebuffer stuff :-).
BUT, why do you not boot your Linux in the good
old VGA normal mode and (it does not matter whether or not xdm enabled).
You may switch from X to a textconsol, great font size, black background, white fonts and
a WHITE flashing cursor ??? And no debugging of any fb drivers is necessary.