xserver-svga and PEX5 possible?

[John Dalbec <jdalbec@cboss.com>]

Cirrus CLGD5446
X 3.3.6-3
I installed xext using apt-get.
I restarted the X server (Ctrl-Alt-Backspace).
How do I get the PEX5 extension to load?  Can I?
TIA,
John