I'm really desperate right now. I got my new Dell XPS 13 (9380) yesterday and at first I've installed Manjaro 2 times, because of this glitching.
First at all, i was able to take a picture of it happening: https://imgur.com/a/fZJrHuk
This happens totally random but with like 10 minute long pauses between it happening. And also since yesterday my whole screen already showed this over everything and I had to force restart the laptop.
I already tried to reinstall mesa, video-linux, video-vesa and also tried every possible combination of all three. Also the hardware GUI shows just "unknown device (Intel Cooporation)" instead of HD620 or whatever it should show.
I seriously hope this is no hardware issue cause I've already waited 5 weeks for shipping (thanks to Dell and the shipping from China) and dont want to wait this time again.
So hae you any tips how to resolve the problem or to test if it could be a hardware issue? I already let the Dell build in diagnosis tool run and it showed no issues.