Description of problem:
On wayland session on the setup with two monitors (laptop and external) the mirroring doesn't work. When I go to the settings and switch to mirroring the external monitor doesn't wake up. This affects for example presentations when you want to show your screen.
This affects just wayland sessions.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Go to Settings->Displays choose one monitor
2. Click on mirroring
external monitor doesn't wake up
mirroring on two monitors
I propose this as a blocker. Possible criterion would be "All applications that can be launched using the standard graphical mechanism of a release-blocking desktop after a default installation of that desktop must start successfully and withstand a basic functionality test." As I think that mirroring is basic funtionality of Display setting
Rui Matos probably work on this (at least Jiri Eischmann says so).
Should be fixed in mutter-3.22.1-5.fc25.x86_64, please re-open if it's not.
I tried it and it seems to work.