Hi,

I am running a Lenovo Yoga 910 with an Intel HD Graphics 620 GPU and a LG 34UM69G-B monitor connected through a Plugable USB-C dock (Link). I am currently running 17.10 LTS of Ubuntu.

The external monitor keeps jumping, sometimes the screen will stay steady, but most times the screen will keep jumping. The laptop monitor isn't affected. I tried another monitor of the same model and it did it as well. I also tried on windows and the monitor work there no problems. Anybody know what could possibly causing this? If you need anymore information let me know thanks.

Mark