Lenovo Ideapad 2500u with Vega 8 HDMI freezes LG C1 both with the old and from 2.1 port, and the TV glitches so bad that I have to power off and unplug HDMI, or it won't even turn back on.
I have tried everything the SEO lets me find for various monitor problems, from classic DDU to uninstalling Lenovo Vantage to mysterious reg edits. Same behavior no matter if it's 1080 or 4k.
The TV works with 4070.