> The ones I found also have a discrete GPU which defeats the point. Having a low power draw, thin and light laptop that can also run fairly recent AAA games - amazing!
So, disable it? Most Zen4 laptops I've seen so far still fit the general thin and light category (albeit, at 15" vs 11-13") and is paired with a mid-range Radeon or GeForce (usually 4060/4070). Buy the laptop and put it in Eco mode in Windows (doesn't multiplex with discrete) or disable it in bios.
The Framework comes with a Zen4 cpu. It's thin and light and the GPU can be disabled:
https://youtu.be/L9Ww_7wwNkM?si=Zke0hCcubnwEl6oe
As someone who owns an AMD laptop (with Radeon discrete), I should point out that AMD's muxing algorithm is pretty conservative, unless you put it into performance mode. Video playback, basic GL/VK/DX operations, desktop usage/web browsing, etc sticks to the integrated GPU. I've only seen the discrete kick in once obvious heavy 3d operations were running (video games, benchmarks, 3d modeling, etc).