Already tried a lot of combinations (modesetting or not nvidia_drm, changing mkinitcpio, etc…).
As I am on an hybrid system I think there is something wrong with PRIME offloading and I guess the HDMI and DP ports are plugged on the i915 chip somehow. Got this behaviour on two machines, a HP Zbook and a XMG Fusion 15.
As Sway dev won’t support using nvidia closed proprietary drivers anytime soon even with GBM support and Nvidia not going to open their source either, I guess it will take quite some time to fix this…
@0ojqr did you get it working with an external monitor ?