I have just flashed the Armbian Stretch mainline kernel 4.14.y. While booting, connected to a HDMI TV/monitor, I can see the start-up text lines initializing various things and at some point (I think it is "starting kernel"), the display gets heavily corrupted with horizontal lines then it switches to a blank screen. The TV displays that it's a 1080p60Hz mode (should be compatible with the display).
Any ideas?
https://youtu.be/n4-TSFzBgO4