Error when one display is dpms off

[kamiyaa]

Not sure if this is the intended behavior but if one display is turned off via dpms (ie. a laptop screen)
grim errors out with (in this case eDP-1):

failed to copy output eDP-1

I would think grim would just grab the other existing display(s)

[emersion]

Right. I wonder if wlroots should just fill a black frame in this case. Or go through requesting a new frame for all visible clients on the DMPS'ed output, then capture.