Hello. I have installled antergos on two my notebooks. First is Toshiba Satelitte (with nvidia) and there my dual monitor works fine.
The second is HP Probook with Radeon HD 7420G and here I cannot make dual monitor work. It always allows me only one monitor. It detects both, I can set position, resolution and so on … but even if I set two monitors, only one will work. Either build in or connected, but never both. I don’t understand this and have no idea how to help myself. I have tried to install different desktop (cinnamon), but that did not help.
Do you have any ideas how to fix this?