vroom: H7600M - I'm wondering if it's too old for the new driver?
Ah mobile gpu... technically you're supposed to get drivers from your notebook vendor not AMD. AMD only provides generic drivers that don't account for tweak/changes than notebook vendors have made.
http://support.amd.com/en-us/kb-articles/Pages/737-28041SupportforATIMobility.aspx
Unfortunately vendors are terrible at providing drivers for anything but their newest products.