The HDMI output is not detecting external monitors on my MSI GS65 running Ubuntu 18.04. I have the NVIDIA 390.77 driver installed, which works great since I am able to run games smoothly on Steam. I do not think the issue is with the NVIDIA drivers because the HDMI output issue seems to be related to motherboard drivers. Edit: Mini DisplayPort also does not work.
Update1: A reinstallation of the NVIDIA drivers did not work and turned out to be a nightmare. Upon reinstalling the NVIDIA drivers, the system kept in reverting to Intel drivers that could not be switched to the NVIDIA ones. A clean reinstallion of Ubuntu fixed it that issue but still no HDMI or mini DisplayPort function.
Update2: Looking at new posts with external monitors not detected there seems to be a general trend with Ubuntu 18.04 having issues with external monitors regardless of it being on MSI laptops.