It's not unusual for DVI input to be underscanned by default, but the HDMI spec says that 1080p should be overscanned. Disabling that requires your TV to advert

It's not unusual for DVI input to be underscanned by default, but the HDMI spec says that 1080p should be overscanned. Disabling that requires your TV to advertise its feature set correctly (there must be a VCDB in the EDID, and it has to indicate that it supports underscanning of CE video modes) and your output device needs to send a type 2 infoframe with a request that the mode be underscanned. I really don't know how common it is for all of this to work without manual intervention - most of what I end up playing with is whatever's sitting in hotel rooms, and that's not necessarily a good representation of the current market.