What is the proprietry driver for VIA PM800 graphics card? How can i enable Unichrome driver for this card?

Can you please tell me what is the proprietry driver for VIA PM800 graphics chipset? I installed an unichrome driver named xserver-xorg-video-openchrome_0.2.903+svn758-0ubuntu1_i386.deb, but it does not seem to get enabled. what should i do for enabling it? My xorg.conf is attatched..

**********************************************************************************************
# xorg.conf (X.Org X Window System server configuration file)
#
# This file was generated by dexconf, the Debian X Configuration tool, using
# values from the debconf database.
#
# Edit this file with caution, and see the xorg.conf manual page.
# (Type "man xorg.conf" at the shell prompt.)
#
# This file is automatically updated on xserver-xorg package upgrades *only*
# if it has not been modified since the last upgrade of the xserver-xorg
# package.
#
# Note that some configuration settings that could be done previously
# in this file, now are automatically configured by the server and settings
# here are ignored.
#
# If you have edited this file but would like it to be automatically updated
# again, run the following command:
# sudo dpkg-reconfigure -phigh xserver-xorg

Section "Device"
 Identifier "Configured Video Device"
EndSection

Section "Monitor"
 Identifier "Configured Monitor"
EndSection

Section "Screen"
 Identifier "Default Screen"
 Monitor "Configured Monitor"
 Device "Configured Video Device"
EndSection
************************************************************************************
how can i solve this problem?