Dell P2815Q Monitor - Manual (Page 53)

Operating the Monitor

53
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 www.dell.com/support
/ and see the
Download section for Video Drivers for latest driver updates.
NOTE: When in the Portrait View Mode, you may experience
performance degradation in graphic-intensive applications (3D
Gaming and etc.).