Dell U2312HM - Rotating the Monitor

Rotating the Monitor
Before you rotate the monitor, your monitor should be fully vertically extended (Vertical Extension) and fully tilted (Tilt) up to avoid hitting the bottom edge of the monitor.
NOTE: To use the Display Rotation function (Landscape versus Portrait view) with your Dell computer, you require an updated graphics driver that is not included
with this monitor. To download the graphics driver, go to support.dell.com and see the Download section for Video Drivers for latest driver updates.