I want to connect two monitors, one to Radeon 7770, and second to integrated intel gpu (i have to do it that way). I installed Radeon's drivers from official site, and Intel drivers from https://01.org/linuxgraphics/ (installed it, ran it, and then system updates were found). They are both displaying something (the one connected to radeon is working as it should and the second one is working only when sytem starts/shutdown), but i want extended desktop and i don't know how to get them to do it. I can see only one monitor in Settings -> Display. Arandr also gives me only one monitor. Anyone can help?