in gnome terminal, Emacs "hears" C-M-SPC as M-SPC

[Eric Hanchrow]

subject pretty much says it all: I'm using recent Emacs from CVS;
gnome-terminal from recent ubuntu.  Almost everything works
perfectly -- but when I hit C-M-SPC, which I do a _lot_, Emacs "hears"
M-SPC.  (By which I mean if I then type C-h l, I see ESC SPC; or if I
do C-h C-c C-M-SPC it tells me that "M-SPC runs the command
just-one-space".  You get the idea).

Is there some way I can fiddle gnome-terminal to fix this?
-- 
... democracy is the worst form of government except all those
other forms that have been tried from time to time.
        -- Winston Churchill, cited at http://en.wikipedia.org/wiki/Democracy