Dell U2711 Monitor - Manual (Page 28)

Mode
When PBP activated
PBP Source
PBP submenu when PBP ON
NOTE: When using DVI source, the contrast adjustment is not available.
Use and to browse and to select "Off" or "On".
Select an input signal for PBP (HDMI/Component/Composite).
Adjust the contrast level of the picture in PBP Mode.