Graphic driver problem

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http://askubuntu.com – I have FireGL V7600 with propriety driver (AMD catalyst), and I am not able to setup dual monitor. The AMD catalyst does not let me to change anything for dual monitor setup. I tried to change /.config/monitors.xml file but I get the error requierd virtual size does not fit. Is it possible to install open source driver for FireGL V7600? (I am not sure this will solve the problem). (HowTos)