Comment 41 for bug 1970957

Guys, can you resume your session by using the Ctrl+Alt+Fn key combo?

E.g.: I have a similar problem where Ubuntu cannot resume from lock screen / dim screen. On screen lock the screen goes dark and then the monitor powers off. In this state mouse movements or key presses won't bring the lock screen back. To resume I have to use Ctrl+Alt+F1 and wait for the login screen to appear. Then I use Ctrl+Alt+F2 to switch back to the previous session, however I also have to move the mouse to bring back the lock screen. Only then I'm able to login again.