I am having dual monitor troubles. I have a monitor connected to my onboard Intel graphics card and a monitor connected to my Radeon HD 7570 graphics card. At the moment I have it set-up so that I am using the fglrx proprietary graphics driver. This causes only the monitor connected to my Radeon graphics card to display while the other monitor does not display anything (even though I can see both VGA devices in the terminal).
For some reason when I try to change the device driver to the AMD/ATI xserver-xorg-video-ati driver and reboot I get the message "The system is running in low-graphics mode". From there I cannot access Unity at all until I revert the video settings back to when I previously was working.
I can get the onboard monitor to work when I have a "manually installed driver" but then the other monitor no longer works. Anybody have any advice?