ATI Radeon HD 6720G2 1GB Driver/Dualscreen issue

Hi all,

I read a load on this board but this is my first post cause im really lost....

I have a asus laptop (K53TA) with an Radeon HD 7620G2 Video card in it.
Since Xubuntu 13.04/13.10 the official ATI driver installs the wrong (HD 6520G2) driver on my Xubuntu installation.

Catalyst does detect my external monitor as second, thats cool but i cant setup my second monitor as an extended monitor.

Im out of ideas atm, and hope someone can give me some new perspectives

(xorg isnt an option cause i need the drivers for the support of AMD Cool 'n Quiet.

Im out of ideas atm, and hope someone can give me some new perspectives...

Greetz,
B1T