Devil's Sight & Darkvision

Rules As Written

Devil's Sight makes darkness, both magical & non-magical, not exist. It is effectively treated as bright light. RAW, this has no interaction with dim light, because there is no god is dead (See JC Ruling). If your character has darkvision 60' and Devil's Sight 120', then for 61'-120' in dim light, they can't see any better than anyone else.

House Rule

Screw all that. Darkness of any shade doesn't matter for you if you have Devil's Sight.

Rationalization/Reason for the Rule

"Hey devil, I'm in a shadow but not like that dark of a shadow!"

"Drats! Foiled again by your clever use of a light dimmer!"