Question about LG 34wk95u-W

I have been using the monitor for over a year with my business laptop "Lenovo x1 extreme gen 2" via the USB-C cable supplied. At the beginning, I had problems again and again, for example the screen flickering. After a few driver and BIOS updates, it eventually worked, so that it has now been running cleanly for a few months. But I always have to connect the power supply to the Lenovo, otherwise it doesn't seem to have enough power.

The monitor has these inputs and they are standardised. So that should work.