I have also the same problem. I'm using the vesa driver for my matrox g550, 
since I can't make mga work. This has worked fine until I updated to intrepid. 
Now I can't use dual screen and I receive the message
Xlib: extension "RANDR" missing on display ":0.0"
from several applications. So far I have noticed the problem when trying to use 
tex text in inkscape (I get the error message but it works again, after 
installing pstoedit) and when trying to use gnome-display-properties (doesn't 
start)

-- 
RandR loaded, but missing
https://bugs.launchpad.net/bugs/157319
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