Hi; I'm very new to elementaryOS. My problem is about external monitors as you see in the title. I want to use dual monitor as one is my laptop's and the other one is my external monitor. When I plug the HDMI cable system detects the external monitor but nothing is being forwarded to the external screen. External monitor is working well with Linux Mint which is also installed the same laptop, also works with my MacBook. So I think the issue is related with elementaryOS and the drivers. Information about some related stuff: I tried to update drivers but couldn't decide what to choose because still not sure the problem is caused by graphic driver. So I need your help. Thanks already.