Same problem on my ASUS GL703VD.
I tried the 18.04 beta today starting a live session with the suggested boot
I can work using an external monitor connected to the HDMI interface. The
laptop display become black during the boot just after few seconds but I can
see the boot progress on the external monitor.
The system works fine with Ubuntu 17.10 with the old kernel
I tried the new kernel 4.16 with ubuntu 17.10 from the mainline
repository but the problem is the same: black laptop screen during boot,
external HDMI monitor working.
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nouveau/nvidia drivers do not work with display in Bionic on Asus
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