I can get Lubuntu 13.10 to display my desktop on either screen, but it refuses to display on both at the same time. Changing the resolution of a screen generally toggles which screen is displayed; using arandr does not solve the issue. My graphics card is a Radeon HD6380G; I've had ubuntu 12.04 working on this before so I'm absolutely stumped
edit:
I actually got this to work using the proprietary drivers, which is the opposite of what most guides say:
sudo apt-get install figlrx
sudo aticonfig --initial
sudo reboot now
monitors work fine now