Oh I wonder how much difference there is from Linux Mint (it's also Debian-based, and a lot like Ubuntu.) Currently have KDE Plasma 5, working at 125%, but have issues with brightness controls. With Cinnamon (GNOME) and 125% fractional scaling, Steam renders super tiny with those settings, and I had games have resolution issues. (Legion 5, 1080p/144, Ryzen 7 4800H, RTX 2060)

Do you use native resolution at 100%? Or fractional scaling? Brightness controls?