Attaching a monitor to running Wayland

Hi all,

I just made the switch from X.org to Wayland and am quite happy with it.
The one thing I am missing is the ability to attach an external monitor
to my laptop with Wayland running.

The monitor is not added as a new output. On X this used to work fine
without any configuration.

Has anyone any hints how I can fix this?

Thanks,

Tobias