I have a ThinkPad T495 with a Ryzen PRO 3700U processor. It has Vega 10 graphics.

On Fedora 30, fonts on an external LCD monitor look terrible. They're very jagged. I tried enabling anti-aliasing in gnome-tweak-tool, but it doesn't appear to have done anything.

Fonts on the built-in 1080p display look fine.

Any pointers?