Ryzen 5700G Display port flickering black screen after Desktop loads

Support Graphics & Display
,
2

1 - so only Pacman -Syyu or -Syyu not -Syuu
2 - you can add more kernels , and select them on Grub > advanced
see this

3 - then add

sudo mhwd-kernel -i linux515 
sudo mhwd-kernel -i linux60
sudo mhwd-kernel -i linux61

reboot and remove old kernel (EOL) 5.19

sudo mhwd-kernel -r linux519