I have two monitors and ATI 34XX graphic card. Ubuntu 12.04.
I'd like to have two different desktops (not virtual workspaces) on these monitors. For example, when I work with left monitor (desktop) it would not affect right one (When I press hot keys, switch virtual workspaces, etc).
I run similar thing on 7.10 or something like that (long time ago), but I can't remember how to do this now.
Another example, I have a Unity WM on left monitor and tile manager Awesome on right one.
I tried to configure this option using AMD control centre, but after reboot I got only I session, another monitor has just a grey background and very odd graphic, looked like no X session on it.