I would like to have my two displays operate as one large desktop; right now, they have the same image -cloned.
In Windows 8, on this same machine, the displays operate as a single large desktop. I don't know how to make that happen in Debian 7.4 under Gnome. I just installed this last week and I have not be able to determine how to change it.
The Sapphire 7770 drives did not appear to be included in the initial installation which I perform as a net install. I eventually found a reference to Catalyst and performed an apt-get to include it. I saw no change to the system; until I rebooted. The boot typically displayed large, low resolution font. But after the update, only the firs 4 lines were course then the screen changes and I get small, high resolution font - very usuable.
But I have found nothing new in the desktop interface. When I use system tool, monitor, it only shows one unrecognized monitor.
I don't know if there is a configuration issue, or what.
Please suggest how I might determine how to get the system to recognize the two monitors.
MB Big Bang-XPower II, CPU Intel i7-3930K CPU @ 3.20GHz x12,
GPU Sapphire 7770, RAM 32GB, 1 TB HDD, 4 ea 64 GB SSD, PSU 850W,
Windows 8, Debian 7.4 (wheezy) 64-bit, GNOME 3.4.2