ok, so... I copied debian's kernel and booted it (instead of use opensuse's kernel). It booted normaly but the suspend still doesn't work... So by now I don't think this is a kernel issue. I don't know how to debug it properly honestly, I know that systemd is the responsible for suspending the system (systemctl suspend) and that's it, I don't know how to use systemd nor I don't know other tools that would participate on a suspension