New H910 AT&T V20 build with BoredSigns + AOSPSignBoard + compatible with the modified Gamma kernel:Gamma kernel w/ second screen enabled for H910:I built BoredSigns "release" this time (instead of debug), so it should perform better. I also haven't noticed the same lock screen blackout problems after flashing this. Also, both cameras are now working in the camera app. Rotation still doesn't appear to work, but so far that is the only (relatively minor) bug I've noticed. I'm using this as my daily driver now!EDIT: I think the trick to avoiding the lock screen blackout is to not enable BoredSigns via the Accessibilty screen, even though it asks you to do it. I'm not sure why you would need to.... the widgets (except the weather one, which still has key problems) work fine.