./fbsize 0xe0000000 0x8000000
produces the response
0xe0000000, 33554432 bytes
which looks like 32meg...
I don't know what an earlier graphics driver would have done: I upgraded my graphics card (from one that had 32 meg) at the same time as my graphics driver.
Right now, I'm running
and my uname -a is
FreeBSD jsmith.org 6.1-RELEASE FreeBSD 6.1-RELEASE #0: Thu Jun 15 09:08:42 EDT 2006 firstname.lastname@example.org
No FreeBSD or Linux nvidia driver has reported 128 meg.
Only the Windows XP driver does this...