VIM3/Ubuntu with Waveshare 11.9 wide display

Hey folks, I’ve just received my VIM3 and I was hoping to use it with Ubuntu and the Waveshare 11.9" display: https://www.waveshare.com/11.9inch-hdmi-lcd.htm

I’ve got Ubuntu working and it outputs correctly on my desktop monitor but when I plug in my waveshare screen, I only get a black screen, no boot screen, nothing.

Any advice?

Any update? I have similar problem