I did an upgrade to 12.10 and for the life of me, can not now get the graphics drivers to work properly. I have two screens but the settings only recognise them as a single "laptop" screen.

Also I have no "additional drivers" in the repositories.

This is the graphics card I have.

lspci -nnk | grep -iA2 vga
03:00.0 VGA compatible controller [0300]: Advanced Micro Devices [AMD] nee ATI RV620 [FirePro 2260] [1002:95cf]
Subsystem: Advanced Micro Devices [AMD] nee ATI Device [1002:2143]
Kernel modules: radeon

I have tried installing drivers and still no luck. Any suggestions about how to get additional drivers?