2nd screen: only mirroring possible

If it is a Starlabs notebook, usually Intel which is included in the kernel. If it is AMD, that too is included in the kernel.
Have you raised your kernel?

sudo add-apt-repository ppa:tuxinvader/lts-mainline

sudo apt update && sudo apt install linux-generic-6.03

Reboot and test...

If you had Nvidia, you probably would know it...