amdgpu issue: where to report?

Hi everyone, I am currently having multiple issues with my latpop, which has an integrated AMD C+GPU and an NVIDIA discrete card. The main problem I have is that the GPU freaks out of nowhere and start blanking. I noticed this happens mostly in Wayland, in X11 instead I have a missing monitor in my multi-monitor setup. I got the system logs from journalctl and I am wondering whether I should open an issue against ArchLinux "linux" package, the "amdgpu" one or shoul I contact upstream directly. I think one of the first two is best, I wanted to double check. Bests, Giovanni