I've tried several of the recommendations in this thread and none of them work. If I switch back to either the 440 or 435 driver the monitor connected to HDMI doesn't work. If I switched back to the X.org Nouveau driver (through Software & Updates, Additional drivers) then all 3 monitors work properly. (I enabled the MOK per the driver installation instructions.) It was like the HDMI port didn't work any more. I installed the 440 driver and after that the laptop would not recognize the monitor connected via the HDMI port. All 3 monitors worked before installing the Nvidia driver. I use two 1080p external monitors one connected to the HDMI port and one connected through a USB-C hub.
I have an MSI Prestige 15.6" Laptop with a GeForce GTX 1650 Mobile / Max-Q graphics card and a built-in Intel vga controller. However, upon reboot, Ubuntu displayed my driver settings as using a "manually installed driver", and won't let me change it: When the external display problem first arose, my initial attempt was to switch back to the open source Xorg drivers. I have an nvidia graphics card, and before the update I was using proprietary drivers. There is a monitor plugged in and ready for use, and nothing I do seems to cause it to be detected. My main concern is the final line: HDMI-1-1 disconnected.
HDMI-1-1 disconnected (normal left inverted right x axis y axis) Even when plugged in, the "detect displays" button within the default settings app doesn't do anything. After upgrading to Ubuntu 18.04, my laptop has been unable to detect/use an external monitor attached via HDMI.
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