I'm on another A220 now and I turned off my screen in advance of the ads. Joke's on me this time, the screen won't turn back on. It is on (I can see that it is backlit) and if there's an announcement that message pops up (among others), but otherwise nothing. Luckily I have an open middle seat so I have the map up on that PTV.
You can't make this up.
I know it can be individually reset by the FA up front, but this is a 40 minute flight and it just isn't worth the effort.
-J.